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Democratic presidential hopefuls Vermont Senator Bernie Sanders (L) and former US Vice President Joe Biden chat during a break in the fourth Democratic primary debate of the 2020 presidential campaign season co-hosted by The New York Times and CNN at Otterbein University in Westerville, Ohio on October 15, 2019. (Photo by SAUL LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images)

Democratic presidential hopefuls Vermont Senator Bernie Sanders (L) and former US Vice President Joe Biden chat during a break in the fourth Democratic primary debate of the 2020 presidential campaign season co-hosted by The New York Times and CNN at Otterbein University in Westerville, Ohio on October 15, 2019. (Photo by SAUL LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images)