Washington (CNN) - When President Barack Obama heads to Philadelphia Monday, he not only will try and keep Pennsylvania's open Senate seat in Democratic hands, he's also going to help raise big bucks for his party.
CNN learned Friday that Obama will be the main attraction at a fundraiser for the Democratic National Committee. A party source tells CNN that the event is expected to raise around $1 million. The DNC has committed to spending $50 million to help Democratic candidates running in this year's midterm elections.
While in Philadelphia Monday, the president teams up at a separate fundraiser for Rep. Joe Sestak the party's Senate nominee. The president's visit will come one week after Vice President Joe Biden headlined a Sestak fundraiser in the Philadelphia area. Sestak also teamed up with former President Bill Clinton at a campaign event that same day.
Last year the former admiral and two-term congressman from southeast Pennsylvania challenged Republican turned Democrat Sen. Arlen Specter for their party's nomination. Obama and Biden both supported Specter. But Sestak survived a nasty intra-party battle and defeated Specter in the May 18 primary.
Sestak finds himself trailing former Rep. Pat Toomey, the Republican Senate nominee, in both campaign cash and in the polls. Toomey was leading Sestak from six to nine points in the most recent surveys of likely Pennsylvania voters.
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