WASHINGTON - Antiwar critics running against Sen. Maria Cantwell, D-Wash., lost one of their candidates this month when the Washington Democrat hired him to work in her campaign for $8,000 a month. In a contest that was always one of the Republicans' better opportunities to beat an incumbent, the big story of the summer was Cantwell's decision to hire (and silence) anti-Iraq War candidate Mark Wilson, one of several war critics whose candidacies threatened her bid for a second term. With polls showing Republican business executive Mike McGavick in a near dead-heat with the liberal lawmaker, as antiwar Democrats attacked...