Sarah Palin and her allies have not taken kindly to comments by Karl Rove this week that the former Alaska governor is not ready to be president, firing back at the former Bush White House political adviser in a fight that illustrates the simmering tensions within the Republican Party. Palin herself made a crack about Rove Thursday but refrained from making pointed comments. But nationally syndicated conservative radio talk show host Mark Levin went after Rove with passion. “I have to say, nice guy aside, this guy needs to get off the stage. He is yesterday’s operative,” Levin said. “There...