Senator Joseph Lieberman cheers while conceding the democratic primary election to challenger Ned Lamont and announcing that he will run as an independent candidate in front of a crowd of supporters in Hartford, Connecticut, in this August 8, 2006 file photo. Lieberman, an independent who supports Democrats in Congress despite his backing of the Iraq war, said on Thursday he was not ruling out endorsing a Republican in the White House race. REUTERS/Brian Snyder/Files
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