Republican president hopeful Newt Gingrich doubled down on his criticism of federal judges and the Supreme Court on Sunday as chief rival Mitt Romney defended his record against likely Democratic attacks. With close to two weeks before GOP voters start choosing their nominee, Gingrich is courting the conservative primary voters he will need to win in Iowa and sustain his campaign against Romney, whose superior organization and pile of cash has him seeming ever more confident as he looks ahead to the general election.