WASHINGTON — It’s June 2020. Former Vice President Joe Biden ground out a win in Iowa, but Sen. Elizabeth Warren crushed him in New Hampshire. Biden narrowly beat Sen. Kamala Harris in Nevada, but she bounced back to win South Carolina a week later.

Crucial Super Tuesday ended in a split decision. Harris won a plurality in California while splitting the Deep South with Biden; Warren racked up delegates in liberal enclaves on the coasts and populist Midwest. Sanders, down but stubbornly...

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