Bernie Sanders made it official this week – he’s running for president in 2020. But things have changed for Democrats since his run in 2016 and this time he’ll be surrounded by a pack of presidential hopefuls advocating for many of the same liberal policies. It appears to be a sign that the party as a whole is a more progressive one than just a few years ago. But how much support is there among rank and file voters for these positions? And can they win elections?

Diane asked NPR’s Ron Elving for some answers.