CBS: Presidential candidate Bernie Sanders won the democratic caucuses in Alaska, Washington and Hawaii on Saturday.
The Vermont senator was trying narrow a gap of 300 delegates won in primaries by Clinton.
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 – drawing more than 17,000 in Seattle this week – and has collected more than $140 million from 2 million donors.
