Oakland was held scoreless from that point.
Nick Folk booted a first-quarter field goal, while Miles Austin and Jason Witten caught a combined 12 catches for 252 yards for the Cowboys (8-3), who had scored just 13 points in splitting their last two contests.
Gradkowski passed for 200 yards and the one touchdown.
Justin Fargas gained 63 yards on 12 carries and Zach Miller added five receptions for 73 yards for the 3-8 Raiders.
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