NASHVILLE, Tenn. - The last time the Vietnam War loomed so large in a presidential election, it was 1972 and American soldiers were still fighting an elusive enemy in Southeast Asia. But the war has taken center stage again as both parties seek the support of Vietnam veterans — turning to them as the emerging elder statesmen among American war veterans. At a conference this past week, on the 40th anniversary of the Gulf of Tonkin Resolution, the Vietnam Veterans of America urged its members to make their voices heard. "This election is probably more important than any election for...