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Super PAC founded by New York City Mayor Michael Bloomberg spends nearly $5 million in California, Florida, and Illinois.
Negative ads with a Halloween twist hit the airwaves
Corporate contributions to groups rare
Contest is No. 1 among outside spending groups
Normally negative GOP spending groups show softer side of Mitt
Bauer-backed super PAC assails president
Super PAC donations flow, Ameritrade founder give big.
A primer on the Supreme Court case that changed the way money could be spent in elections.
Nonprofit social welfare organizations may become more potent political donors than super PACs. And they don't have to disclose who gave money.
Why it's so tough to expose super PAC mystery donors.
