Presidential candidates may accept contributions of $2,500 from individuals and $5,000 from political action committees. Individual supporters long have been free to spend more — as much as they wished — as long as they did not coordinate with campaigns. But the Supreme Court ruling in Citizens United, combined with lower court decisions, has opened dangerous new horizons for independent expenditures. Corporations and labor unions, as well as wealthy individuals, are now free to spend unlimited amounts, and these contributions can be bundled by a political action committee.
Full Article: The power of super PACs – The Washington Post.