There's an election tomorrow worth keeping an eye on. The Wisconsin Supreme Court election has turned into a proxy battle for the union busting "budget repair bill" Scott Walker rammed through.

The fate of Wisconsin governor Scott Walker's Budget Repair Bill may hang in the balance Tuesday, when the state's voters head to the polls. The April 5 election, which pits conservative supreme court justice David Prosser against liberal assistant attorney general JoAnne Kloppenburg, will determine whether judicial conservatives or liberal activists have a 4-3 majority on the highest court in the state.

In a typical year, Prosser would win another 10-year term in a walk. But 2011 is far from typical. The left and unions are angry and energized over the Budget Repair Bill that curtailed the collective bargaining power of public employee unions. And while a Prosser victory is possible, all of that energy means that Kloppenburg is favored to win tomorrow's very low turnout election--historically, only about 20 percent of the state's voters show up to the polls in springtime elections.

It's been an ugly campaign as you can see from this recent ad

Prosser was elected in 2001, unopposed with 549,860 votes. In a 2007 election for the Wisconsin Supreme Court, the winner prevailed 487,422 votes to 342,371.

What to look for tomorrow? It would have been a stunning upset for Kloppenburg to win, so that's the first test of how organized and angry pro-middle class voters are. But also keep an eye on the votes cast for each - that will give us a rough indication of the effects these labor busting moves are having on real voters, in real elections.