With the brief exception of those four heady days after the Iowa caucuses, he has never been a front-runner;now he will be more fully scrutinised.

• 除了爱荷华预备会议后那短暂而又令人兴奋的四天以外，奥巴马还一直没有成为领先者，现在他面临着公众更加详细而全面关注。