WASHINGTON—Elizabeth Warren’s departure from the Democratic presidential contest left Joe Biden and Bernie Sanders competing to win over her largely college-educated base of support ahead of a series of primaries over the next month.

Ms. Warren exited the presidential race Thursday and said she wanted to take some time to consider whether to endorse one of the two men, the only top-tier candidates left in the Democratic race. Public surveys indicate Ms. Warren’s supporters, who boosted the Massachusetts senator in national…

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