Twelve Democratic presidential candidates debate during the fourth Democratic presidential candidates 2020 election debate at Otterbein University in Westerville, Ohio, October 15, 2019. (Reuters / Shannon Stapleton)

Twelve Democratic presidential candidates debate during the fourth Democratic presidential candidates 2020 election debate at Otterbein University in Westerville, Ohio, October 15, 2019. (Reuters / Shannon Stapleton)

Twelve Democratic presidential candidates debate during the fourth Democratic presidential candidates 2020 election debate at Otterbein University in Westerville, Ohio, October 15, 2019. (Reuters / Shannon Stapleton)