Stewart charges to win at Daytona

The Roush drivers thought they had the field covered, and probably still liked their chances on the final green-white-checkered restart. Kenseth was the leader with Biffle on his bumper, as second-place Stewart was lined up with Kasey Kahne.

Kenseth and Biffle pulled away for a lap, but Stewart came quick on the outside, moved to the front, then crossed down the track in front of Kenseth for the lead. Seconds later, Biffle seemed to wiggle in traffic and cars began wrecking all over the track.

"I'm not really sure what happened, they just started wrecking behind us," said Kenseth, who started from the pole in his bid to become the first driver since 1982 to sweep the two Daytona races in the same season.

"It seems like we always end these things in green-white-checkers, and whenever you do, really anybody that's in the front few tandems has a shot to win the thing. It's so unpredictable. You do things those last two laps that you'd never do the rest of the race. It's really hard to figure."

The final results showed Jeff Burton came from nowhere to finish second in a Richard Childress Racing Chevrolet, followed by Kenseth in a Ford and Joey Logano in a Toyota. Biffle, who was in third on the final restart, dropped all the way to 21st.

Roughly 90 minutes before the race, NASCAR announced AJ Allmendinger had been suspended for failing a random drug test taken last week at Kentucky.