Texas quarterback Arch Manning remained optimistic about Texas' national championship chances despite an embarrassing 29-21 defeat to Florida on Saturday at Ben Hill Griffin Stadium in Gainesville, Florida.Manning spoke with the media after the loss. The sophomore signal-caller kept a positive tone about Texas' hopes of competing in the college football playoffs."Absolutely. It's a long season. Anything can happen," Manning said. "We've just got to continue to get better each week and take it one game at a time."Florida's defensive line was all over Manning, who only completed 16 of 29 passes for 263 yards and two touchdowns. The Gators sacked the young quarterback six times, forcing him to commit mistakes, which proved costly for the No. 9 Longhorns.Manning's rushing game was also capped, as he could only run for 37 yards in 15 carries. He was visibly affected by the raucous crowd of 90,714, as he couldn't find a way to beat the Gators' linebackers, who harassed and hurried him all afternoon.Texas' upset loss to Florida may cost them its lofty spot in the AP Top 25 College Football Poll, possibly tumbling out of the Top 10.It was the Longhorns' first loss in the SEC and could lead to another one if they cannot get their act together next Saturday against No. 5 Oklahoma.