RICHMOND, Va. -- Republican Sen. George Allen attacked Democrat James Webb for opposing a constitutional flag-burning ban and Webb fired back Tuesday, calling Allen a coward who sat out the Vietnam War "playing cowboy at a dude ranch in Nevada." In a searing press statement, a senior adviser to Webb, a decorated Vietnam veteran, went to extraordinary lengths to question Allen's fortitude, even repeatedly using the middle name the senator detests and never uses, Felix. "While Jim Webb and others of George Felix Allen Jr.'s generation were fighting for our freedoms and for our symbols of freedom in Vietnam, George...