Mike Huckabee and Marco Rubio at the debate in Cleveland: Rubio . “If I’m our nominee, how is Hillary Clinton going to lecture me about living paycheque to paycheque? I was raised paycheque to paycheque,” said Rubio in response to one question. Photograph: Eric Thayer/The New York Times

Marco Rubio walked into the first Republican presidential debate on Thursday night as a decided underdog. But the youthful Florida senator emerged,(...)