Big Money Wins, and has been for a decade.

According to Cap Times’ Mike Ivey:

So much for idea that labor unions are pumping all the big money into political campaigns.
A new report from the Wisconsin Democracy Campaign report released Thursday shows that business interests give $12 for every $1 donated by labor unions. 

The report available here looks at records for all statewide races from 1999 through mid-October 2010.