I live in Massachusetts, Peoples Republic of, in the dreaded heavily liberal Northeast, Kennedy country (ick!). One of the redeeming facts about this state is that we are one of 24 that can adopt/repeal laws by referendum questions. It takes a fair amount of signatures and work but it can be done, as the following will show.
Many moons ago, we managed to pass Proposition 2 1/2, so called because it limited property taxes across the state to 2.5% per year. It can only be overridden by a vote of the taxpayers. That is rare, but it does occur. The pols have to really make a good case though! Goes to show you that even liberal weasels have a limit!! I suggest the fine folks of Wisconsin contact Barbara Anderson at the Citizens for Limited Taxation (www.cltg.org), and maybe they can give you some good ideas. CLT was directly responsible for getting Prop. 2 1/2 passed.
Even better, in the 2002 election, we repealed biligual education by a large margin (but the teachers unions and the pols are doing their best to gut the mandate from the voters. Best of all, there was a referendum question to, now get this, abolish the state income tax!! It got 45% of the vote! In Massachusetts. Ted Kennedy's Massachusetts. The pols practically wet their pants, and are deathly afraid to raise taxes, at least in any obvious way. We are now going through the tax cuts targeted at police teachers etc, anything to hurt the voters, to get the mood of the voters to allow them to raise taxes. Naturally, we are getting lots of AFL-CIO commercials blaming Republican Mitt Romney for the cuts, and commending the Democrat-controlled legislature for overriding his "Draconian" cuts. The dirty little secret is that the Dems control everything, and there is nothing Romney can do with, or without, their say so.
The bottom line is, if Wisconsin is a referendum state, it can be done. Otherwise, you are going to have to get conservative Republicans into the Governor's office and the rest of the state offices.
By the way, next door, in Connecticut, their property taxes are ridiculous. I am talking $18 - 35 or so per $1000 of value, and that was 7 years ago when I was looking for a home. Then add one of the highest gasoline taxes, and you have a pricey state indeed.