Mike Tate (WI Dem Chair) just posted this on Facebook:

Friends- here is the deal. As of tonight there are 4 good Democrats running for Governor. I think the field is set. So here is my request, pick a candidate, support them, work for them, etc. Or don't pick and work with the party till we have a nominee on May 9. Either way, let's not attack our fellow Dems. Each want nothing more than to defeat Walker and heal this state. They are all good people with the right intentions. On May 9 we will have our candidate and providence willing our next Governor. Let's keep it clean and remember the primary process gives us OUR nominee. We will be united against Walker at sun up on May 9. - Mike Tate