Bruce Springsteen, Foo Fighters, Dave Matthews, Brittany Howard and Joan Baez will headline a star-studded protest festival set for the Washington area a month before the midterm elections.Springsteen and Rage Against the Machine guitarist Tom Morello announced the festival on Wednesday while performing together at Nationals Park in Washington as Springsteen winds down his Land of Hope and Dreams American tour.At the concert on Wednesday, Springsteen played many of his most political songs,...