The tide turned against Sen. Hillary Rodham Clinton (D-N.Y.) on Capitol Hill Wednesday, as even some of her supporters said she should consider ending her White House bid. Some uncommitted Democratic superdelegates refused to meet with the beleaguered candidate when her campaign approached them in the hope of wooing them. Reps. Brad Miller (N.C.) and Lincoln Davis (Tenn.) said they were invited to meet Clinton but declined to attend. Nevertheless, Clinton’s campaign pushed back hard against growing sentiment that she cannot win the nomination. The senator scheduled meetings to woo superdelegates and at least forestall them from endorsing Sen. Barack...