Stop, hey, what’s that sound? Actually, it’s the noise a great political party makes when it loses what’s left of its mind. And it happened — where else? — on Fox News on Sunday, when Mitt Romney bought fully into the claim that gas prices are high thanks to an Obama administration plot. . . .

. . . [T]he president of the United States doesn’t control gasoline prices, or even have much influence over those prices. Oil prices are set in a world market, and America, which accounts for only about a tenth of world production, can’t move those prices much. Indeed, the recent rise in gas prices has taken place despite rising U.S. oil production and falling imports. . . .

As Richard Hofstadter pointed out in his classic 1964 essay “The Paranoid Style in American Politics,” crazy conspiracy theories have been an American tradition ever since clergymen began warning that Thomas Jefferson was an agent of the Bavarian Illuminati. But it’s one thing to have a paranoid fringe playing a marginal role in a nation’s political life; it’s something quite different when that fringe takes over a whole party, to the point where candidates must share, or pretend to share, that fringe’s paranoia to receive the party’s presidential nod. . . .

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