The country long ago moved beyond John Kerry's Presidential ambitions, but the Senator, as he seems never to tire of reminding us, has not. Now Mr. Kerry's throbbing grievances jeopardize President Bush's nominee for U.S. Ambassador to Belgium. Last week Sam Fox, a 77-year-old St. Louis businessman, sat before the Senate Foreign Relations Committee for a confirmation hearing widely expected to be uncontroversial. But in the 2004 campaign, Mr. Fox gave $50,000 to the Kerry opposition group Swift Boat Veterans for Truth. After some desultory questioning about "the image of America in Europe," Mr. Kerry solicited Mr. Fox's opinions as...