As we first reported here, Obama campaign manager David Plouffe wooed top Clinton donors at a private presentation in Manhattan yesterday, and the early indications are that such efforts are paying off.

Top Hillary supporter Ed Rendell is hosting a fundraiser for Obama tonight in Philadelphia. My sense from talking to Hillary donors is that from their point of view, there's just no percentage in not getting behind Obama, and while there's definitely still a bit of grumbling in these circles, they're basically falling into line.

One thing driving this is that Obama, according to Rendell, is privately signaling to the leading Clinton fundraisers that it's urgent that the Dem fundraising establishment come together and raise huge sums to combat the McCain-GOP apparatus -- right now. And the fundraisers are heeding the call.