Presidential candidates Hillary Clinton and Barack Obama waged a tight campaign fight across Ohio on Sunday two days before crucial voting that could virtually nail down the Democratic nomination or prolong the party battle into the spring.

McCain, with dwindling competition from the only other major Republican candidate, former Arkansas Gov. Mike Huckabee, took the day off. A big night on Tuesday could put McCain very close to the 1,191 delegates he needs to clinch the Republican nomination at this summer’s party convention.