For months, the underdog in the presidential primary refused to concede defeat. He fought hard in state after state, even as the front-runner amassed a delegate advantage that would be virtually impossible to overcome.
The extended feud between Bernie Sanders and Hillary Clinton in 2016, which turned more bitter as time passed, left behind Democratic divisions that would ultimately contribute to their party’s crushing general election loss.
Eight years later, some Republicans fear that history may soon repeat itself.
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