We know the Kock Brothers are behind Americans for Prosperity -
The Tea Party, WIS GOP, Americans for Prosperity, and Grandsons of Liberty all were involved in voter caging plans to disenfranchise tens or hundreds of thousands of Wisconsin voters in 2008 - focusing on students and people in the lower income bracket.
I would not be surprised if the kocks are behind this too.
Here is a link for further reading...(figures it comes from DU!!)
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=439x240105"To the casual political observer, Reince Priebus, the newly elected chairman of the Republican National Committee, seemed to come out of nowhere. But to Wisconsin progressives, Priebus is known as the state Republican Party operative who allegedly tried to suppress the votes of minorities and students in both the recent midterm congressional elections and the 2008 presidential election -- in apparent coordination with David Koch's Americans For Prosperity.
...On the eve of the election for RNC chair, Mark Block, who just stepped down from his post as state director for the Wisconsin chapter of Americans for Prosperity, lauded Priebus in a Daily Caller op-ed for having supplied AFP with bus transportation and GOP staff support "for the movement of an enormous number of Tea Party activists from the outskirts of Madison to the rally site on the steps of the State Capitol, where over 8,000 people gathered" for a 2009 AFP rally.
But the collegiality of the two involves logistical planning of another kind. Priebus was allegedly involved in an alleged voter suppression scheme launched by a Wisconsin Tea Party group, GrandSons of Liberty, with the assistance of Americans for Prosperity.