Socialism means many different things to many different people, and it means a lot to Democratic presidential candidate Bernie Sanders. 

Friday morning, the senator from Vermont appeared on NPR's Morning Edition, where he defined socialism as an effort to create a society where all people can live with dignity. 

Is socialism that simple, and why are so many Americans turned off by that term? 

Peter Dreier, a professor of politics and public policy at Occidental College, joins the show to explain more.