Every Saturday morning, we’re publishing “This Week in the 2020 Race”: a quick way to catch up on the presidential campaign and the field of 24 candidates for the Democratic nomination. Here’s our latest edition:

Harris gets a bump from the debates

An immediate consensus emerged among pundits and the political class after the first Democratic presidential debates: Senator Kamala Harris of California had performed exceedingly well; former Vice President Joseph R. Biden Jr. not so much.

Three polls released this week suggested that voters agreed.

The polls — two were national surveys, and one polled Iowa caucusgoers — all showed Ms. Harris vaulting into second place behind Mr. Biden. They also showed a dip in support for Mr. Biden, though more than one in five respondents still said he was their first choice.

The results also affirmed a broader trend: Senator Elizabeth Warren of Massachusetts has gained ground as Senator Bernie Sanders of Vermont has fallen back. Ms. Warren remained solidly in the top tier, finishing third in all three polls. Mr. Sanders, who led several polls before Mr. Biden entered the race, finished fourth in each of them.