Wisconsin Democrats want to know how many Republican bills were spurred by corporate donations after documents surfaced showing Gov. Scott Walker asked business leaders to donate to a conservative group supporting his 2012 recall campaign.

The Guardian reported Wednesday that it obtained leaked documents showing Walker and his fundraisers approached corporate leaders and asked them to donate to Wisconsin Club for Growth. Walker sought money from the head of a company that produced lead used in paint, and after the owner gave $750,000 to Wisconsin Club for Growth, Republicans passed legislation granting lead manufacturers immunity from paint-poisoning lawsuits.

Assembly Democrats said during a news conference that the documents raise more questions about what other bills the GOP has passed in exchange for donations and that clean, open government in Wisconsin is dead.

The U.S. Supreme Court's 2010 Citizens United ruling allows unlimited political spending by corporations.