It's not just blacks whose Clintonism is both unshakable and inexplicable

Las Vegas audience exposes Bernie Sanders' Latino problem

His call for a “people’s revolution” has electrified progressive supporters across the US and put him ahead in New Hampshire, one of the states which will kick off the election for the Democratic presidential nomination.

But in other states the 74-year-old lags badly with Latinos and African Americans, who prefer Clinton by a wide margin. 

Analysts say he is sunk unless he can close the gap.