A Biden negative bounce? CNN's new poll has the race tied up at 47.  Obviously, Obama will get a big bounce this week (I expect he'll be up by double digits a week from now), but hes having a hard time with the Hill backers... who re probably still wondering, what's Biden have that Hillary doesn't?

So what’s the difference now?

It may be supporters of Hillary Clinton, who still would prefer the Senator from New York as the Democratic Party’s presidential nominee.

Sixty-six percent of Clinton supporters, registered Democrats who want Clinton as the nominee, are now backing Obama. That’s down from 75 percent in the end of June. Twenty-seven percent of them now say they’ll support McCain, up from 16 percent in late June.

“The number of Clinton Democrats who say they would vote for McCain has gone up 11 points since June, enough to account for most although not all of the support McCain has gained in that time,” says Holland.

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And in a sign that Mccain will go straight at former Hillary supporters, they've launched this new ad, featuring former Wisconsin Hillary delegate Debra Bartoshevich. (Remember she was the one stripped of her seat by state Democrats for failking to fall in behind The One.)