McCain said Romney has become a person with great potential as the next President, adding that he is convinced that the nation needs a new President.And while McCain's attacks on earmarks were familiar territory for the Arizona Senator, he also debuted a new line of attack on Gingrich, who recently proposed setting up a permanent colony on the moon."I think we ought to send Newt Gingrich to the moon and Mitt Romney to the White House," he said.