Tom Allen Challenges Susan Collins for Maine's Senate Seat

Rep. Tom Allen (D-Maine) announced Tuesday that he will challenge Sen. Susan CollinsSusan CollinsSenators press Obama education chief on reforms GOP senator: Trump endorsement could depend on VP Senate panel approves 0M for international climate fund MORE, who is considered one of the most vulnerable Republicans, in 2008.

"Maine and America face unprecedented challenges," Allen said in this video announcing his run. "For the last six years, the Bush Administration, supported by a Republican Congress, has failed the American people."

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