Bernie Sanders: an idea whose time has come?

Bernie Sanders was the first independent and first self-professed socialist to be voted first into the House and then the US Senate, for decades. He has espoused the same message for over 40 years: affordable education, universal health care and economic equality. For most of those 40 years he was a voice in the wilderness but suddenly his message is resonating with thousands of young Americans - so what’s going on?