Are the Democrats in Trouble??

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At least in Pennsylvania, a substantial number of supporters of both Obama and Clinton say they will vote for McCain if their candidate does not get the Democratic nomination. I expected this of Obama supporters, who tend to be younger, more likely to be registered independents, or even Republicans, than Clinton supporters. But in Pennsylvania, 19% of Clinton supporters say they will vote for McCain, while 20% of Obama supporters say they will vote for McCain. Interestingly, 13% of Clinton supporters WILL NOT VOTE if Obama gets the nomination, whereas only 3% of Obama supporters will not vote. Can somebody please explain this to me???