If at first you don't succeed, get some friends in high places to shut your opponents up. That's the latest Washington power play, as Democrats and liberals attack the Chamber of Commerce and independent spending groups in an attempt to stop businesses from participating in politics.

Since the Supreme Court's January decision in Citizens United v. FEC, Democrats in Congress have been trying to pass legislation to repeal the First Amendment for business, though not for unions. Having failed on that score, they're now turning...