The most forceful attack on Mitt Romney's healthcare record may have come too late to make a difference in the Republican presidential race. Although Romney has faced questions and skepticism about healthcare throughout the campaign, none of his rivals mounted the kind of aggressive, sustained indictment that former Sen. Rick Santorum (Penn.) launched into during Thursday night's debate. "It was as deep as any of the criticism Gov. Romney has faced from any of the other candidates since the day he got into the race," said Republican strategist Kevin Madden, who is a Romney supporter.