Illinois Democrat Alexi Giannoulias discussed the need to amend the Constitution to overturn Citizens United, which he called “a dangerous decision,” in a debate with rival US Senate candidate Mark Kirk. His Republican opponent, who has a habit of distorting and lying about his record, spoke in favor of greater campaign disclosure laws. However, Kirk voted against the DISCLOSE Act , which would have made sure that political organizations disclose their donors and make their funding sources more transparent. Giannoulias, on the other hand, has signed the Pledge to Protect America’s Democracy , which calls on candidates for Congress to overturn Citizens United.
Crossroads GPS, which does not disclose its donors, has spent over $3 million  in ads attacking Giannoulias, and its sister “Super PAC” American Crossroads has spent over $1 million  to smear Giannoulias. Two groups which do not disclose their donors and are backed by corporate entities, the New Prosperity Foundation  and the US Chamber of Commerce , spent around a half-million dollars each in ads to help Mark Kirk.