Inside the Sanders campaign, with Bernie's official photographer

The Bernie Sanders campaign may be down this week, but ask any of his supporters and they'll tell you the Vermont Senator is far from out.

Despite winning just one of the five states in Tuesday's primaries (Rhode Island), his largely young and fervently passionate backers say his message against economic inequality will resonate long after this race is over.

Arun Chaudhary served as President Barack Obama's official videographer, and has been filming Mr Sanders and his supporters.

The BBC caught up with him in New York for a behind-the-scenes look at capturing the campaign.

Filmed by Ian Cartwright. Edited by Bill McKenna. Produced by Suzanne Kianpour & Barbara Plett-Usher.