On Sunday night, former Vice President Joe Biden and Sen. Bernie Sanders challenged each other’s records at the debate hosted by CNN in Washington, D.C., but it was the coronavirus that dominated both the debate and headlines. We once again partnered with Ipsos to track how the debate affects likely primary voters’ feelings about the candidates. The FiveThirtyEight/Ipsos poll, conducted using Ipsos’s KnowledgePanel, interviews the same group of voters twice, once on either side of the debate, to capture both the “before” and “after” picture.