Comedy Central funnyman Stephen Colbert, like most of his friends and allies on the left, thinks that last year's Supreme Court ruling in Citizens United v. FEC is, literally, ridiculous. To make his case that the ruling invites "unlimited corporate money" to dominate politics, Mr. Colbert decided to set up a political action committee (PAC) of his own. So far, though, the joke's been on him.

The hilarity began last month, when Mr. Colbert began to have difficulty setting...