According to Mother Jones, “Some of the first exploiters of the campaign finance free-for-all aren’t corporations, but labor unions.”

In recent weeks, the American Federation of State, County, and Municipal Employees (AFSCME) and the AFL-CIO have begun to use the new Citizens United rules to promote their preferred candidates in closely fought contests, such as Lt. Gov. Bill Halter’s challenge to Sen. Blanche Lincoln in Arkansas’ Democratic Senate primary, and the special election in Pennsylvania’s 12th congressional district, which Democrat Mark Critz won in mid-May.