The rules changed after the landmark `` Citizen 's United '' ruling by the Supreme Court in 2010 . They can indirectly express support for or opposition to a candidate but may not explicitly urge the viewer to vote for or against that candidate . Super PACs can spend unlimited money but must disclose donors . This is a major change from prior election cycles where super PAC spending was largely unregulated and unreported, with no limit on how much they could raise or give to candidates.
The rules changed after the landmark `` Citizen 's United '' ruling by the Supreme Court in 2010 . Super PACs can spend unlimited money but must disclose donors . This is a major change from prior election cycles where super PAC spending was largely unregulated and unreported, with no limit on how much they could raise or give to candidates.