Super-PAC contributions are the ultimate "black money" of American politics.
The two jousted during a rare joint appearance before a Senate panel.
The White House denounced the Supreme Court's ruling, but it hasn't said what it will do.
The protester secretly filmed in the Supreme Court tells his story to The Hill.
Mississippi voters will encounter a trio of new campaign ads in the final week of the primary.
Dems face tens of millions of dollars worth of attack ads from conservative groups.
Justice Roberts said limits "intrude without justification" on the First Amendment.
The Citizens United PAC is endorsing Chad Mathis to replace retiring Rep. Spencer Bachus (R-Ala.).