Amid so much other news, a Senate vote last week to allow loaded guns in national parks slipped under the media radar. The vote shows how the political cause of gun control is as dead as a mounted moose.

By 67-29, the Senate passed Oklahoma Republican Tom Coburn's amendment to let law-abiding visitors carry legal firearms into national parks. This overturns a 1983 federal rule requiring that firearms be kept unloaded and in an inaccessible place such as a trunk of a car. The provision (now part of credit-card legislation)...