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Sen. Joe Lieberman (I-CT) has has crossed party lines to endorse Republican candidate John McCain for president.  Lieberman was the Democrats' candidate for Vice President in 2000.  He is now an Independent, because he switched his party affiliation in order to run for re-election after losing the Democratic primary in 2006.

"Being a Republican is important. Being a Democrat is important. But you know what's more important than that? The interest and well-being of the United States of America," Lieberman said when he announced his endorsement.  He also said that he is endorsing McCain because McCain is "the most capable to be Commander in Chief on day one of his administration."