Chicago Bears quarterback Jason Campbell (2) is sacked by San Francisco 49ers defensive tackle Justin Smith, right, and linebacker Aldon Smith, not pictured, during the fourth quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. The 49ers won 32-7. (AP Photo/Tony Avelar)

Chicago Bears running back Matt Forte (22) is tackled by San Francisco 49ers defensive tackle Isaac Sopoaga (90), linebacker Patrick Willis (52), and defensive tackle Justin Smith (94) during the second half of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Tony Avelar)

Chicago Bears running back Matt Forte (22) is tackled by San Francisco 49ers linebacker NaVorro Bowman (53) and other defenders during the first half of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis (85) and quarterback Colin Kaepernick (7) celebrate after connecting on a 3-yard touchdown pass during the first quarter of an NFL football game against the Chicago Bears in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Wide receiver Michael Crabtree #15 of the San Francisco 49ers makes a touchdown catch against cornerback Charles Tillman #33 of the Chicago Bears at Candlestick Park in San Francisco, California on November 19, 2012. (Ric Tapia/NFL)

San Francisco 49ers linebacker Aldon Smith (99) is congratulated by linebacker Ahmad Brooks after sacking Chicago Bears quarterback Jason Campbell (2) during the third quarter of an NFL football game in San Francisco, Monday, Nov. 19, 2012. (AP Photo/Marcio Jose Sanchez)

Running back Kendall Hunter #32 of the San Francisco 49ers runs for a touchdown against the Chicago Bears at Candlestick Park in San Francisco, California on November 19, 2012. (Ric Tapia/NFL)

Running back Frank Gore #21 of the San Francisco 49ers leaps over cornerback Tim Jennings #26 and safety Major Wright #21 of the Chicago Bears at Candlestick Park in San Francisco, California on November 19, 2012. (Ric Tapia/NFL)

New England Patriots tight end Rob Gronkowski (87) spikes the ball after his touchdown catch against the Indianapolis Colts in the first quarter of an NFL football game at Gillette Stadium in Foxborough, Mass., Sunday, Nov. 18, 2012. (AP Photo/Michael Dwyer)

Washington Redskins fullback Darrel Young carries the ball into the end zone for a touchdown as Philadelphia Eagles strong safety Nate Allen (29) pursues during the first half of an NFL football game in Landover, Md., Sunday, Nov. 18, 2012. (AP Photo/Alex Brandon)

Defensive tackle Kyle Williams #95 of the Buffalo Bills celebrates after a play during the second half of an NFL football game Thursday, Nov. 15, 2012 in Orchard Park, N.Y. (AP Photo/Gary Wiepert)

Washington Redskins cornerback DeAngelo Hall intercepts a pass intended for Philadelphia Eagles tight end Brent Celek, right during the first half of an NFL football game in Landover, Md., Sunday, Nov. 18, 2012. (AP Photo/Patrick Semansky)

St. Louis Rams quarterback Sam Bradford, right, throws under pressure from New York Jets defensive end Muhammad Wilkerson during the first quarter of an NFL football game on Sunday, Nov. 18, 2012, in St. Louis. (AP Photo/L.G. Patterson)

Tampa Bay Buccaneers' Nate Byham (82) catches a touchdown pass against Carolina Panthers' Haruki Nakamura (43) during the first half of an NFL football game in Charlotte, N.C., Sunday, Nov. 18, 2012. (AP Photo/Bob Leverone)

Green Bay Packers running back James Starks is stopped by Detroit Lions strong safety Erik Coleman, center, and linebacker Stephen Tulloch during the first quarter of an NFL football game against the Green Bay Packers in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Carlos Osorio)

Dallas Cowboys' quarterbacks Tony Romo (9) and Kyle Orton (18) run out of the tunnel an onto the field for warm ups before an NFL football game against the Cleveland Browns Sunday, Nov. 18, 2012 in Arlington, Texas. (AP Photo/Brandon Wade)

Nov 15, 2012; Orchard Park, NY, USA; Miami Dolphins running back Marcus Thigpen (34) is tackled by Buffalo Bills wide receiver Brad Smith (16) - outside linebacker Arthur Moats (52) and Buffalo Bills fullback Corey McIntyre (38) on a punt return during the first half of a game at Ralph Wilson Stadium. Mandatory Credit: Mark Konezny-US PRESSWIRE

Buffalo Bills cornerback Leodis McKelvin (21) runs for a touchdwon on a punt return during the first half of an NFL football game against the Miami Dolphins, Thursday, Nov. 15, 2012, in Orchard Park, N.Y. (AP Photo/Bill Wippert)

Buffalo Bills running back C.J. Spiller (28) is tackled by Miami Dolphins' Reshad Jones (20) during the first half of an NFL football game on Thursday, Nov. 15, 2012, in Orchard Park, N.Y. (AP Photo/Bill Wippert)

Buffalo Bills free safety Jairus Byrd (31) celebrates with teammate Da'Norris Searcy (25) after intercepting a pass during the second half of an NFL football game Thursday, Nov. 15, 2012 in Orchard Park, N.Y. The Bills won the game 19-14. (AP Photo/Bill Wippert)

Green Bay Packers quarterback Aaron Rodgers (12) and tight end Jermichael Finley (88) celebrate after FInley's 20-yard touchdown reception against the Detroit Lions in the second quarter of an NFL game in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Paul Sancya)

Cincinnati Bengals wide receiver A.J. Green (18) gets past Kansas City Chiefs cornerback Javier Arenas (21) and free safety Kendrick Lewis (23) to catch a short pass for a touchdown during the first quarter of an NFL football game on Sunday, Nov. 18, 2012, in Kansas City, Mo. (AP Photo/Josh Adams)

Washington Redskins wide receiver Aldrick Robinson (11)celebrates his touchdown with defensive end Chris Baker (92) during the first half of an NFL football game against the Philadelphia Eagles in Landover, Md., Sunday, Nov. 18, 2012. (AP Photo/Nick Wass)

Dallas Cowboys' Orlando Scandrick (32) is unable to stop Cleveland Browns' Josh Gordon (13) from making a catch in the first half of an NFL football game on Sunday, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Sharon Ellman)

Green Bay Packers tight end Jermichael Finley (88) scores on a 20-yard touchdown reception as Detroit Lions defensive back Don Carey (32) and safety Ricardo Silva (39) defend in the second quarter of an NFL game in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Paul Sancya)

Detroit Lions wide receiver Calvin Johnson (81) celebrates a 25-yard touchdown reception against the Green Bay Packers in the third quarter of their NFL football game in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Paul Sancya)

Jacksonville Jaguars' Justin Blackmon (14) scores a touchdown against the Houston Texans during the fourth quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Patric Schneider)

Atlanta Falcons outside linebacker Stephen Nicholas (54) tackles Arizona Cardinals quarterback Ryan Lindley (14) for a sack as Arizona Cardinals fullback Anthony Sherman (35) blocks during the second half of an NFL football game Sunday, Nov. 18, 2012, in Atlanta. (AP Photo/David Goldman)

Cleveland Browns' Trent Richardson (33) drags Dallas Cowboys' Dan Connor (52) for extra yards on a run from scrimmage in the second half of an NFL football game, Sunday, Nov. 18, 2012 in Arlington, Texas. (AP Photo/Brandon Wade)

Washington Redskins wide receiver Santana Moss pulls in a touchdown pass under pressure form Philadelphia Eagles free safety Kurt Coleman during the second half of an NFL football game in Landover, Md., Sunday, Nov. 18, 2012. (AP Photo/Alex Brandon)

Jacksonville Jaguars' Marcedes Lewis, left, Zach Potter, right, and Will Ta'ufo'ou (45) celebrate a touchdown against the Houston Texans during the third quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Dave Einsel)

Detroit Lions tight end Brandon Pettigrew (87) makes a reception as he is tackled by Green Bay Packers inside linebacker A.J. Hawk (50) in the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in Detroit. (AP Photo/Duane Burleson)

Cincinnati Bengals quarterback Andy Dalton(14) runs into the end zone ahead of Kansas City Chiefs inside linebacker Jovan Belcher to score a touchdown during the first half of a an NFL football game Sunday, Nov. 18, 2012, in Kansas City, Mo. (AP Photo/Josh Adams)

Carolina Panthers' Cam Newton (1) scrambles past Tampa Bay Buccaneers' Gerald McCoy (93) during the first half of an NFL football game in Charlotte, N.C., Sunday, Nov. 18, 2012. (AP Photo/Bob Leverone)

Green Bay Packers wide receiver Jordy Nelson (87) breaks a tackle by Detroit Lions free safety Ricardo Silva (39) in the second quarter of an NFL football game at Ford Field in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Rick Osentoski)

Houston Texans' Owen Daniels (81) makes a catch ahead of Jacksonville Jaguars' Derek Cox (21) during the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Patric Schneider)

New York Jets inside linebacker Bart Scott (57) is pulled down by St. Louis Rams tight end Matthew Mulligan after recovering a fumble by quarterback Sam Bradford (8) and running it back 38-yards during the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in St. Louis. (AP Photo/Tom Gannam)

Green Bay Packers tight end Jermichael Finley (88) celebrates his touchdown as Detroit Lions cornerback Jacob Lacey (21) and defensive back Don Carey (32) react in the second quarter of an NFL football game at Ford Field in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Rick Osentoski)

Houston Texans fullback James Casey (86) spikes the ball after scoring a touchdown against the Jacksonville Jaguars during the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Dave Einsel)

Detroit Lions running back Mikel Leshoure (25) fights his way past Green Bay Packers inside linebacker Brad Jones (59) into the end zone for a touchdown an NFL football game at Ford Field in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Rick Osentoski)

St. Louis Rams defensive end Chris Long (91) celebrates after sacking New York Jets quarterback Mark Sanchez for a 3-yard loss during the second quarter of an NFL football game, Sunday, Nov. 18, 2012, in St. Louis. (AP Photo/L.G. Patterson)

Dallas Cowboys wide receiver Dez Bryant (88) grabs a touchdown catch in front of Cleveland Browns' Sheldon Brown, rear, in the second half of an NFL football game, Sunday, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Brandon Wade)

Green Bay Packers free safety M.D. Jennings (43) intercepts a pass intended for Detroit Lions tight end Tony Scheffler (85) for a 72 yard-touchdown in the third quarter of their NFL football game in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Paul Sancya)

Dallas Cowboys running back Felix Jones (28) breaks into the end zone for a touchdown through Cleveland Browns defenders Jabaal Sheard (97) and L.J. Fort (58) as Craig Robertson (53) and Emmanuel Acho (59) watch in the second half of an NFL football game, Sunday, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Sharon Ellman)

Washington Redskins tight end Logan Paulsen (82) drives into the end zone for a touchdown as Philadelphia Eagles free safety Kurt Coleman tries to hang on during the second half of an NFL football game in Landover, Md., Sunday, Nov. 18, 2012. (AP Photo/Alex Brandon)

Jacksonville Jaguars' Marcedes Lewis (89) is grabbed by Houston Texans' Troy Nolan during the first quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Dave Einsel)

New Orleans Saints cornerback Patrick Robinson misses a pass intended for Oakland Raiders wide receiver Derek Hagan during the first quarter of an NFL football game in Oakland, Calif., Sunday, Nov. 18, 2012. (AP Photo/Marcio Jose Sanchez)

Dallas Cowboys strong safety Danny McCray (40) is unable to stop Cleveland Browns tight end Benjamin Watson (82) from grabbing a pass for a touchdown late in the second half of an NFL football game, Sunday, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Brandon Wade)

Atlanta Falcons tight end Tony Gonzalez (88) looks to an official after making a catch as Arizona Cardinals cornerback Greg Toler (28) looks on during the second half of an NFL football game Sunday, Nov. 18, 2012, in Atlanta. The Falcons won 23-19. (AP Photo/David Goldman)

Atlanta Falcons wide receiver Harry Douglas (83) is hit by Arizona Cardinals free safety Kerry Rhodes (25) as Arizona Cardinals strong safety Adrian Wilson (24) looks on during the second half of an NFL football game Sunday, Nov. 18, 2012, in Atlanta. (AP Photo/David Goldman)

New Orleans Saints cornerback Patrick Robinson leaps and misses a pass intended for Oakland Raiders wide receiver Derek Hagan during the first quarter of an NFL football game in Oakland, Calif., Sunday, Nov. 18, 2012. (AP Photo/Marcio Jose Sanchez)

New Orleans Saints tight end Jimmy Graham celebrates after scoring a touchdown against the Oakland Raiders as tight end David Thomas, right, watches during the first quarter of an NFL football game in Oakland, Calif., Sunday, Nov. 18, 2012. (AP Photo/Ben Margot)

Green Bay Packers wide receiver Randall Cobb (18) catches a touchdown pass while defended by Detroit Lions free safety Ricardo Silva (39) during the fourth quarter of an NFL football game at Ford Field in Detroit, Sunday, Nov. 18, 2012. (AP Photo/Carlos Osorio)

Houston Texans tight end Garrett Graham (88) scores a touchdown ahead of Jacksonville Jaguars' Dawan Landry (26) during the fourth quarter of an NFL football game, Sunday, Nov. 18, 2012, in Houston. (AP Photo/Patric Schneider)

St. Louis Rams quarterback Sam Bradford throws under pressure from New York Jets linebackers Calvin Pace, right, and David Harris, left, during the fourth quarter of an NFL football game, Sunday, Nov. 18, 2012, in St. Louis. The Jets won 27-13. (AP Photo/Seth Perlman)

Cleveland Browns free safety Eric Hagg, right, attempts to bring down Dallas Cowboys' Jason Witten (82) in the second half of an NFL football game, Sunday, Nov. 18, 2012, in Arlington, Texas. (AP Photo/Brandon Wade)

Carolina Panthers' Brandon LaFell (11) runs into the end zone for a tocuhdown as Tampa Bay Buccaneers' Mark Barron (24) defends during the second half of an NFL football game in Charlotte, N.C., Sunday, Nov. 18, 2012. (AP Photo/Nell Redmond)

Oakland Raiders tight end Brandon Myers (83) celebrates after scoring a touchdown during the second quarter of an NFL football game against the New Orleans Saints, Sunday, Nov. 18, 2012, in Oakland, Calif. At right is Raiders running back Owen Schmitt. (AP Photo/Marcio Jose Sanchez)

Pittsburgh Steelers quarterback Byron Leftwich (4) is sacked by Baltimore Ravens defensive end Haloti Ngata (92) in the fourth quarter of an NFL football game on Sunday, Nov. 18, 2012, in Pittsburgh. The Ravens won 13-10. (AP Photo/Don Wright)

Oakland Raiders wide receiver Denarius Moore (17)stiff arms New Orleans Saints outside linebacker David Hawthorne (57) during the NFL game between the New Orleans Saints and the Oakland Raiders at the O.co Coliseum in Oakland, California on October 18, 2012. (Ric Tapia/NFL)

New England Patriots tight end Rob Gronkowski (87) runs for a gain during the game against the Indianapolis Colts at Gillette Stadium on November 18, 2012 in Foxboro, Massachusetts. New England won 59-24. (Aaron M. Sprecher/NFL)

Baltimore Ravens running back Ray Rice (27) runs around Pittsburgh Steelers nose tackle Casey Hampton (98) during the third quarter of an NFL football game in Pittsburgh, Sunday, Nov. 18, 2012. (AP Photo/Gene J. Puskar)

Oakland Raiders wide receiver Juron Criner (84) catches the ball in the end-zone for a touchdown while being guarded by New Orleans Saints defensive back Johnny Patrick (32) during the NFL game between the New Orleans Saints and the Oakland Raiders at the O.co Coliseum in Oakland, California on October 18, 2012. (Ric Tapia/NFL)

Pittsburgh Steelers quarterback Byron Leftwich (4) out runs Baltimore Ravens linebacker Terrell Suggs (55) on his way to the end zone for a touchdown during the first quarter of an NFL football game, Sunday, Nov. 18, 2012, in Pittsburgh. (AP Photo/Gene J. Puskar)

Denver Broncos free safety Jim Leonhard (36) intercepts a pass as cornerback Champ Bailey (24) and San Diego Chargers wide receiver Malcom Floyd (80) look on in the fourth quarter of an NFL football game against the, Sunday, Nov. 18, 2012, in Denver. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) hands the ball off to running back Ronnie Hillman (21) in the fourth quarter of an NFL football game against the San Diego Chargers, Sunday, Nov. 18, 2012, in Denver. The Broncos won 30-23. (AP Photo/Jack Dempsey)

Denver Broncos tight end Joel Dreessen (81) is tackled by San Diego Chargers cornerback Marcus Gilchrist (38) and defensive back Shareece Wright (29) after catching a pass in the fourth quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. (AP Photo/Jack Dempsey)

San Diego Chargers wide receiver Danario Alexander (84) catches a pass for a touchdown as Denver Broncos defensive back Tony Carter (32) defends in the fourth quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. (AP Photo/Jack Dempsey)

Denver Broncos outside linebacker Wesley Woodyard (52) celebrates with outside linebacker Von Miller (58) after recovering a fumble by San Diego Chargers quarterback Philip Rivers (17) in the third quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. (AP Photo/Jack Dempsey)

Denver Broncos wide receiver Eric Decker (87) takes the ball into the endzone ahead of San Diego Chargers running back Curtis Brinkley (36) in the third quarter of an NFL football game, Sunday, Nov. 18, 2012, in Denver. (AP Photo/Jack Dempsey)

New England Patriots quarterback Tom Brady (12) eludes Indianapolis Colts defensive end Ricardo Mathews (91) to get a pass off during the second quarter of an NFL football game at Gillette Stadium in Foxborough, Mass., Sunday, Nov. 18, 2012. (AP Photo/Charles Krupa)

New Orleans Saints running back Mark Ingram carries the ball on a 27-yard touchdown run during the third quarter of an NFL football game against the New Orleans Saints in Oakland, Calif., Sunday, Nov. 18, 2012. At left is Oakland Raiders outside linebacker Philip Wheeler. (AP Photo/Ben Margot)

Oakland Raiders fullback Marcel Reece, top, carries the ball over New Orleans Saints cornerback Jabari Greer during the first quarter of an NFL football game in Oakland, Calif., Sunday, Nov. 18, 2012. (AP Photo/Ben Margot)