CNN

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Of all the differences between Barack Obama and John McCain, here's one that could really make a difference down the home stretch: One has a president to help him and the other one does not. And at first glance, it's not what you might think.

After his appearance with Barack Obama tonight at a rally in Kissimmee, Florida, former president Bill Clinton plans to criss-cross the country on behalf of Obama in the closing days of the campaign. Tonight will mark President Clinton's first joint appearance with Obama on the campaign trail. Despite his lukewarm support at first,President Clinton as well as Hillary Clinton will campaign hard in the next few days to help Obama close the deal.

But what about John McCain?

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