Kathleen Falk, ex County Exec of Dane Co. (Madison)
Tom Barrett, sitting Mayor of Milwaukee (& ex-Congressman)
Kathleen Vinehout (one of the WI 14, ex university professor & current dairy farmer)
Doug LaFollette, scion of the LaFollette family of Progressives, chemistry PhD & long-time WI Secretary of State, who made something of a name for himself during the "troubles" by refusing to certify bills passed by the Republicans & signed by Walker, thereby delaying some of the crazy new Republican laws from taking effect & buying some time for court appeals.
We can have democracy in this country, or we can have great wealth concentrated in the hands of a few, but we can't have both.--Justice Louis Brandeis