After spending a presidential campaign on the bus with McCain, Senator Joe Lieberman is now singing a different tune. The Connecticut independent, who just months ago accused Obama of being “naïve, untested, and unwilling,” now applauds Obama’s national security team, and he’s even clashed on the Senate floor with McCain. Obama, who disappointed Lieberman by backing challenger Ned Lamont in his 2006 re-election bid, gained some points by urging Democrats to preserve Lieberman’s chairmanship of the Homeland Security Committee. “That obviously sealed the deal and I appreciated it a lot,” Lieberman said. Although he’s up for re-election in 2012, the senator says his change of heart is not politically motivated.