This was a pretty interesting little result in the Emerson poll of Wisconsin:
The first Emerson College Wisconsin Poll of the Democratic primary finds Bernie Sanders holding a strong lead with 39% of the vote, followed by Joe Biden at 24%. In third place, Elizabeth Warren, the only other candidate in double digits, is at 14%. The poll was conducted March 15-17, n=324, +/- 5.4%. […]
If Joe Biden decides against running, it appears that this vote would split between Bernie Sanders at 23%, Beto O’Rourke at 20%, Kamala Harris at 16% and Elizabeth Warren at 14%. No other candidate receives over 10% if Biden does not run.
There is a good case to be made that Biden’s strong polling hurts the non-Sanders candidates more than it hurts Sanders, especially in places where the Vermont Independent Senator’s base is more consolidated.