Mnementh on 27 January 2020
538 talks about the recent polling upswing for Sanders: https://fivethirtyeight.com/features/election-update-sanders-is-on-the-upswing/
As most of these polls were conducted before the impeachment process, it will be interesting to see with the next batch of polls, how much the sitting senators (Sanders, Warren, Klobuchar) were hurt by the fact they couldn't campaign in Iowa.
