WASHINGTON (Reuters) - With the dramatic winnowing of the Democratic presidential field, the 14 nominating contests held on Tuesday largely came down to a single question: Could former Vice President Joe Biden amass enough delegates to slow Senator Bernie Sanders’ path to the nomination?
As polls closed in the eastern United States, the emerging answer appeared to be "Yes." Polls showed Biden, whose candidacy was buoyed this week by a wave of high-profile endorsements after his South Carolina victory on Saturday, outperforming expectations.