George W. Bush unavailable for comment.

(CNN) – President Barack Obama discussed his frustration with gridlock in Washington, saying his “biggest disappointment” in his nearly four years in office has been the failure to oversee change in the nation’s political climate.

“My biggest disappointment is that we haven’t changed the tone in Washington as much as I would have liked,” Obama said in a CBS News interview that aired Sunday.

Asked if he bears any blame for the stalemate, Obama said the buck stops at his desk.

“I think that, you know, as president I bear responsibility for everything, to some degree,” he said on CBS’ “60 Minutes.”

Throughout the presidential campaign, Mitt Romney’s campaign and Obama’s critics have dogged the president for failing to get certain legislation passed in recent years, while Team Obama responds by faulting congressional Republicans for not compromising.