Which Dem is most likely to outperform polling?

[Senator Spark]

Besides CCM, I think it might be Barnes.
Three reasons:
1.) Unlike in presidential elections, polling did not Democratic support in WI in the 2018 midterms
2.) Abortion will be a big issue driving voters to the polls in Wisconsin with a strongly Republican legislature and legacy antiabortion laws subject to partisan enforcement.
3.) Wisconsin has same-day voter registration, so factor (2) may drive a lot of young pro-choice voters to vote who are now unregistered and thus cannot be picked up by polling.