Minnesota Vikings running back Ian Johnson, right, drops the ball after scoring his second touchdown of the game after Vikings full back Niehemiah Broughton, center, blocked Dallas Cowboys lineback Victor Butler (57) during the third quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Minnesota Vikings quarterback Sage Rosenfels hands off to Vikings running back Albert Young during the third quarter of an NFL preseason football game against the Dallas Cowboys in Minneapolis on Friday, Sept. 4, 2009. Dallas won 35-31. (AP Photo/Tom Olmscheid)

Minnesota Vikings' quarterback John David Booty looks to pass during the second half of a NFL preseason football game against the Dallas Cowboys, Friday, Sept. 4, 2009 in Minneapolis. The Cowboys won 35-31. (AP Photo/Paul Battaglia)

Minnesota Vikings tight end Jeff Dugan lands in the end zone under Dallas Cowboys defenders as he scores on a 36-yard touchdown pass from Tarvaris Jackson during the first quarter of an NFL preseason football game in Minneapolis Friday, Sept. 4, 2009. The Cowboys beat the Vikings 35-31. (AP Photo/Ann Heisenfelt)

Dallas Cowboys Steve Octavien runs back a 44-yard interception for a touchdown on a pass by Minnesota Vikings quarterback John David Booty during the third quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Dallas Cowboys running back Tashard Choice, left, is tackled by Minnesota Vikings safety Husain Abdullah, right, during the first quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Dallas Cowboys head coach Wade Phillips watches his team against the Minnesota Vikings during the second quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Minnesota Vikings defensive tackle Letroy Guion, center, and Fred Evans, right, sack Dallas Cowboys quarterback Rudy Carpenter, left, during the third quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Minnesota Vikings wide receiver Nick Moore (14) has a pass go off his fingertips as Dallas Cowboys safety Courtney Brown (27) defends during the first quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Minnesota Vikings head coach Brad Childress disagrees with a call during the second quarter of an NFL preseason football game against the Dallas Cowboys in Minneapolis, Friday, Sept. 4, 2009. (AP Photo/Ann Heisenfelt)

Dallas Cowboys tight end Martellus Bennett (80) leaves behind Minnesota Vikings corner back Marcus McCauley on a 31-yard gain during the first quarter of an NFL preseason football game in Minneapolis Friday, Sept. 4, 2009. (AP Photo/Ann Heisenfelt)

Minnesota Vikings' quarterback Tarvaris Jackson (7) looks to pass during the first half of a NFL preseason football game against the Dallas Cowboys, Friday, Sept. 4, 2009, in Minneapolis. (AP Photo/Paul Battaglia)

Minnesota Vikings' wide receiver Darius Reynaud (82) somersaults into the end zone after an 81-yard punt-return during the first half of a NFL preseason football game against the Dallas Cowboys, Friday, Sept. 4, 2009, in Minneapolis. (AP Photo/Paul Battaglia)

Dallas Cowboys' running back Tashard Choice (23) is upended by Minnesota Vikings' safety Husain Abdullah during the first half of a NFL preseason football game, Friday, Sept. 4, 2009 in Minneapolis. Vikings' safety Jamarca Sanford (33) looks on during the play. (AP Photo/Paul Battaglia)

Dallas Cowboys quarterback Jon Kitna (3) drops back for a pass during the first quarter of an NFL preseason football game against the Minnesota Vikings in Minneapolis, Friday, Sept. 4, 2009. (AP Photo/Ann Heisenfelt)

Minnesota Vikings wide receiver Darius Reynaud (82) leaves behind Dallas Cowboys wide receiver Jesse Holley, lower left, and safety DeAngelo Smith, upper left, on an 81-yard punt-return for a touchdown during the second quarter of an NFL preseason football game in Minneapolis Friday, Sept. 4, 2009. (AP Photo/Ann Heisenfelt)

Minnesota Vikings defensive tackle Letroy Guion, left, dives to recover a fumble by Dallas Cowboys quarterback Jon Kitna (3) during the first quarter of an NFL preseason football game in Minneapolis, Friday, Sept. 4, 2009. (AP Photo/Ann Heisenfelt)

Dallas Cowboys quarterback Jon Kitna, top, is tackled by Minnesota Vikings safety Husain Abdullah, bottom, after an 11-yard gain during the first quarter of an NFL preseason football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Minnesota Vikings quarterback Brett Favre, left, and Dallas Cowboys quarterback Tony Romo, right, talk before their teams' preseason NFL football game in Minneapolis on Friday, Sept. 4, 2009. (AP Photo/Tom Olmscheid)

Dallas Cowboys' quarterback Tony Romo, front, talks with Minnesota Vikings' quarterback Brett Favre before the begining of an NFL preseason football game, Friday, Sept. 4, 2009, in Minneapolis. (AP Photo/Paul Battaglia)