Early Exit Polls contain some interesting data. One thing that stands out is that voters from households with a union member comprise about 1/3rd of the electorate. That is higher than either the 2010 gubernatorial election in Wisconsin or the 2008 presidential election in Wisconsin.
On the other hand, those who identify with the Tea Party movement are turning out in similar numbers to that which happened in the 2010 elections in which Tea Party members turned out in droves and helped propel Gov. Scott Walker to victory.