Obama Campaign Warns President 'Will Be Outspent'

The Obama campaign sounded an alarm to supporters Thursday urging them to donate, blasting an email titled, "I will be outspent."

"I will be the first president in modern history to be outspent in his re-election campaign, if things continue as they have so far," reads the email. "I'm not just talking about the super PACs and anonymous outside groups -- I'm talking about the Romney campaign itself. Those outside groups just add even more to the underlying problem."

"We can be outspent and still win -- but we can't be outspent 10 to 1 and still win."

The email blast follows a warning from officials on Wednesday that the campaign had been outspent by a three-to-one margin.

The email also attacks Romney for his weekend fundraising retreat at the lavish Park City, Utah resort of Deer Valley, where he met with top donors, top Republicans and Karl Rove, the co-founder of the American Crossroads super PAC.

Obama has held almost twice as many fundraisers in the third and fourth years of his term as George W. Bush held when he was running for reelection.

Below, a list of super PAC donors looking to make their mark on the 2012 elections:

Donors Giving $500,000-Plus To Super PACs