SALEM, N.H. — Eyeing their first wins in a capricious campaign, Republican Donald Trump lashed out at his opponents Monday while Democrat Bernie Sanders sought to play it safe on the eve of the nation’s initial primary. GOP contenders vying for second and third saw fresh hopes for survival after New Hampshire as both parties settled in for a drawn-out slog to the nomination. As snowfall brought yet more uncertainty to the race’s final hours, Hillary Clinton tried to move past talk of a shakeup in her campaign and controversy over comments by supporters that women should feel obliged to vote for her.