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John Kerry lost the Secretary of State sweepstakes to Hillary Clinton, but that hasn't lowered his diplomatic ambitions. The Journal reported Thursday that the Senate Foreign Relations Chairman is mulling a trip to Iran, and with the blessing of the Obama Administration.

If the mullahs had any sense, they'd send him a government plane. Beset by almost daily demonstrations by a democratic opposition that has been growing despite beatings and arrests since the stolen June election, Mr. Kerry would arrive from Washington to show the Iranian people that at least someone still favors the regime. He would be the most senior American to visit Tehran in 30 years and his trip would convey legitimacy that the dictatorship is especially eager to have at the current moment.

The Kerry...