CHARLOTTE, N.C. -- If there were millionaires at Tuesday's happy hour for prospective donors of the three major super PACs backing congressional Democrats and President Obama, they were not the recognizable backers of the groups. And there was not much exclusive about the affair.

At the door of a cozy, downtown bar a short walk from the site of the Democratic Party’s convention, an employee checked off names of attendees on an iPad. But he did not seem to stop anyone, and so this reporter walked on through the door. 

The event was one of several being hosted this week by Unity Convention 2012, a combine of Priorities USA Action, Majority PAC and House Majority PAC. The three Democratic super PACs are lagging their Republican counterparts in the race for outside money in the 2012 election by about a three-to-one margin. Priorities USA Action made a bit of progress last month -- reportedly its best fundraising month ever, pulling in $10 million.

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