Led by a backup quarterback, Stanford pulled off a stunner. Tavita Pritchard threw a 10-yard touchdown pass to Mark Bradford on a fourth-and-goal with 49 seconds remaining Saturday night, giving the 41-point underdog Cardinal a 24-23 victory over No. 2 Southern California. The Cardinal (2-4, 1-3 Pac-10) moved 45 yards in 11 plays for the winning touchdown after John David Booty threw the third of his four interceptions. A leaping Bradford caught the ball over cornerback Mozique McCurtis in the corner of the end zone, leaving the crowd of 85,125 at the Los Angeles Coliseum in stunned silence.