With less than a day before Pennsylvania voters take to the polls Hilary Clinton maintains an edge in most polls. Many pundits suggest that an Obama win, or perhaps even a narrow Clinton victory, could end Clinton's race for the presidency but I think this is foolish. The Dems are heading for a convention decision and that decision will depend to some extent on Clinton's performance in the Pennsyvania and Indiana primaries. Losses or very narrow wins by Clinton probably mean that superdelegates will be going with Obama and the popularity that he still seems to have going even if Clinton "catches up" somewhat in delegates based on these later races. It'll be hard for superdelegates to vote against the majority of delegates decided by voters, though certainly stranger things have happended in American politics.
Odds? I'd say 57/43 in favor of Obama with little chance the PA vote will change things.