Super PACs are a major factor in elections as they constitute independent political committees that support a candidate with donation from union, companies or even individuals. These donations can be unlimited and anonymous. These groups contribute to a candidate in an indirect way such as by running favorable ads about a candidate. Ads sponsored by super PACs are usually negative. In January 2010, Supreme Court Citizens United v. Federal Election Commission decided that the government cannot restrict the spending of corporations, unions and other groups for political campaigns. Thus, that decision led to a great wave of unlimited amounts of money to be invested on political campaigns.