Sanders wins primary caucuses in Alaska and Washington

WASHINGTON — Bernie Sanders won Democratic presidential caucuses in Alaska and Washington state on Saturday, victories he hopes will stoke a spring comeback against the commanding front-runner, Hillary Clinton. The Vermont senator was trying to build his enduring support among liberal activists into a three-state sweep that could help him narrow a gap of 300 delegates won in primaries by Clinton. The two Democrats were also competing in Hawaii. While Sanders faces a steep climb to the nomination, a string of losses for Clinton would highlight persistent vulnerabilities within her own party. Sanders continues to attract tens of thousands to his rallies —...