Voters across 14 states are starting to weigh in on the Democratic presidential nomination contest as Sen. Bernie Sanders seeks to fend off newly resurgent Joe Biden after the former vice president’s landslide victory in South Carolina.

Mr. Biden’s strength with African-American voters there helped resurrect his campaign after three straight losses, and the Democratic establishment began consolidating around him on Monday with the endorsements of Sen. Amy Klobuchar of Minnesota and former South Bend, Ind., Mayor Pete Buttigieg,…

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