The U.S. economic slump is rippling through college budgets across the country. And it’s only going to get worse if the football season -- the largest source of sports revenue at most big schools -- is scrapped or delayed this fall.For a snapshot of how U.S. universities are coping, look no further than Clemson -- the only school to participate in each of the past five College Football Playoffs -- where athletic officials are hoping for the best but also planning for the worst.