FILE - In this Feb. 19, 2020 file photo, Democratic presidential candidates, Sen. Elizabeth Warren, D-Mass., left, and Sen. Bernie Sanders, I-Vt., talk during a Democratic presidential primary debate in Las Vegas, hosted by NBC News and MSNBC. Choosing a presidential candidate based primarily on loathing the alternative is not the strongest of electoral strategies. That's why leaders of the progressive movement say many Americans who were enthralled by Bernie Sanders and his slogan of “Not Me. Us,” won’t be as likely to settle for Joe Biden. (AP Photo/John Locher)
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