BOSTON -- Massachusetts has 10 congressional districts, all of which are occupied by Democratic members, and in its quest to retake Congress and re-install Nancy Pelosi as speaker of the House, the party hadn't worried that it might lose one of them. But that’s exactly the situation with less than five weeks till Election Day, as Rep. John Tierney (pictured, at right) trails Richard Tisei, a social liberal -- and openly gay -- Republican challenger. Tisei (pictured, at left) is a seasoned state legislator, but what put the race in Massachusetts’ 6th District in play...

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