As a group, the Blue Dog Coalition of fiscally conservative Democrats may be the most vulnerable House incumbents in the 2010 election. But they are getting an assist from the Blue Dog political action committee, which handed out the most contributions of any politician-controlled PAC through November 2009, according to CQ MoneyLine.

The Blue Dog PAC has made $635,000 in donations thus far this cycle, $500,000 of which went to members of the coalition and their PACs. The rest went to home state party committees of a number of Blue Dogs, including many facing competitive re-election contests, and to one House candidate, Polk County Supervisor of Elections Lori Edwards, who is running for the open seat in Florida’s 12th district.

The PAC’s money came largely from other political committees — it reported $1.3 million in receipts through Nov. 30, $1.2 million of which came from PACs. The majority of donors to the Blue Dog PAC were trade association and corporate political committees, many of which have also given thousands of dollars to Blue Dog members individually.