As Super Tuesday looms, Sanders faces hard realities of delegate numbers

The senator from Vermont has become Hillary Clinton’s chief rival in the contest for the Democratic nomination.

FORT COLLINS, COLO. — Bernie Sanders packed another campaign rally here Sunday night with the kind of display of enthusiasm that he hopes will power him to a series of victories on Super Tuesday. But for the senator from Vermont, Tuesday also could be the day he begins to feel the bracing realities of the Democratic presidential nominating process.