LOS ANGELES — Knock off Texas tonight in one of college football's most anticipated games, and top-ranked Southern Cal can lay claim to something even more elusive than three consecutive national titles. Immortality."If USC wins this game, I think you have to put them up there with the greatest teams of all time," longtime ABC broadcaster Keith Jackson said. "I always thought the 1972 USC team was the best I ever saw. Then came Nebraska in 1995. If the Trojans win, they are right there."Others will go a step further. A win over Texas (12-0) in the Rose Bowl would...