A website that is a must-bookmark on your web browser if you have even a passing interest in politics is OpenSecrets.org.
This page shows the top donors in Wis. fight and where the $ goes. Note the group and where. All unions go heavy for Dems.
For S&Gs, Ron Kind (D-LaCrosse) received $16,000 from the Koch brothers. Any one got a mole to burn?