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US Senate tilts toward support of gay marriage

Senator Bill Nelson speaks during a hearing on March 1, 2012 on Capitol Hill in Washington, DC. Nelson endorsed gay marriage on Thursday, shifting the chamber in favor of rights for same-sex couples.US Senator Bill Nelson endorsed gay marriage on Thursday, shifting the chamber in favor of rights for same-sex couples. Nelson, a Democrat from Florida, became the 51st lawmaker in the 100-seat Senate to support gay unions, the latest in a string of lawmakers to change their position on the sensitive political issue.