Barack Obama remains favourite to win the Democratic nomination, but his advantage over Hillary Clinton has diminished.

Thanks to Texas and especially Ohio, there is a gleam in Mrs Clinton's teeth once more. Just as in New Hampshire, just as on Super Tuesday, she has checked his supposedly irresistible momentum. Will commentators now stop saying that anything about this race is "inevitable"? The answer, inevitably, is no: we are as slow to learn as Mrs Clinton is to know when she is beat.