Idaho (0-4) had tied the game on the final play of regulation, when Dominique Blackman tossed an 8-yard TD pass to Mike Scott in the corner of the end zone. Trey Farquahar's extra point made it 34-all.
Farquahar's 49-yard field goal put the Vandals ahead in overtime, but Smith and Claiborne pulled it out for the Cowboys (1-3).
Smith was 23 of 35 for 365 yards and was not intercepted, and Chris McNeill caught eight passes for 219 yards. Blackman finished 34 of 46 for 306 yards and had three touchdowns and no interceptions.
The 3-point stance discusses the late-season issues the nation's top receivers are having, the fitting Hornung Award finalists, and Oklahoma State.
Tennessee coach Butch Jones and Vanderbilt coach Derek Mason discuss their preparations for Week 13.
SEC Network's Greg McElroy and Jabari Greer discuss how Georgia will be able to contain Georgia Tech's offense.
South Carolina's loss to The Citadel, coupled with Georgia and Florida struggling in tight victories, was an embarrassment for the conference.
Needing a win to clinch the MAC West title, Northern Illinois falls short as Ohio stuns the Huskies 26-21.
Greg Windham and J.D. Sprague each threw a touchdown pass, Josiah Yazdani kicked four field goals and Ohio kept Northern Illinois from advancing to the Mid-American Conference title game with a 2