President Obama responded Friday to a comment from former New Hampshire governor John Sununu, who suggested that retired Gen. Colin Powell endorsed the Democratic incumbent because both men are black. 

Sununu, an adviser to Mitt Romney, later backed away from that comment in a statement released by the Republican's campaign. 

"I don't think that there are many people in America who would question Gen, Powell's credibility, his patriotism, his willingness to tell it straight," the president told radio host Michael Smerconish in an interview Friday. "So any suggestion that Gen. Powell would make such a  profound statement in such an important election based on anything other than what he thought would be best for America doesn't make much sense." 

Obama again promised to get to the bottom of what happened in Benghazi on Sept. 11, but he suggested that Republicans have only tried to politicize the issue. 

"I've always been straight with the American people with the decisions that we've made," he said, while Romney "hasn't been restrained by facts." 

Obama also mocked Romney's new campaign theme, which contrasts the "hope and change" of the president's 2008 campaign with real, big change.   

Romney's policies are "not big changes, they're a repeat, a relapse of things that haven't worked for over a decade now," the president said.