In 2008, Citizens United, an incorporated, conservative advocacy group, was prohibited from paying to advertise or air a documentary movie critical of Hillary Clinton, at the time the front-runner for the Democratic presidential nomination. The reason was a 2002 law prohibiting corporations from paying for communications that even mentioned candidates for federal office. Citizens United sued, and eventually, in January 2010, the U.S. Supreme Court ruled that corporations have a right to advocate the election or defeat of candidates.