BOSTON, Mass.— When Bill Richardson and his entourage move through Boston— the site of next month's Democratic National Convention— people notice. On Wednesday, Richardson, chairman of the convention, arrived for a quick visit to prepare for next month's event. The city's notorious rush-hour traffic jams relented, if only for a moment, to make way for the New Mexico governor's Massachusetts state police-powered motorcade. And when Richardson, a former minor league baseball pitcher, arrived at historic Fenway Park for a sold-out Red Sox game, team officials hustled him through the players' entrance to a second-row seat on the first baseline, where...