White House press secretary Jay Carney on Tuesday said that President Obama couldn't "go back in time" as he was peppered with questions about whether the president regretted promising that Americans who liked their health insurance plans could keep them. "The president, as awesomely powerful as the office is, can't go back in time," Carney told reporters. Carney conceded that "there is no question that this rollout has not gone as smoothly as we had hoped," but sidestepped repeated questions about whether the president had over-promised. Instead, Carney said that the president's repeated guarantee that “if you like your healthcare...