“For the sake of that 5 percent, this will be the sourest spring. About a fifth of Clinton and Obama supporters now say they wouldn’t vote for the other candidate in the general election. Meanwhile, on the other side, voters get an unobstructed view of the Republican nominee. John McCain’s approval ratings have soared 11 points. He is now viewed positively by 67 percent of Americans. A month ago, McCain was losing to Obama among independents by double digits in a general election matchup. Now McCain has a lead among this group.”