The US media consistently label Sanders as a "leftie," "left leaning," even "fringe left wing." His policy positions are not so far left in many parts of the world, where they have universal health care, free education, and so on. I read something recently that said business executives in other countries are horrified at the wage gap between skilled workers and top executives. The question in many peoples' minds is, "How long can this go on?" Anyone who seriously contemplates the idea of the "eternal growth capitalism" we have in the US has to be sympathetic to what Sanders is saying.
It's interesting that some on the right are objecting to these corporate excesses, although it's not clear how electing Republicans will address the issues they claim to care about. Tax reductions for high income earners doesn't cut it. The right consistently maintains the only true purpose of government is to pave the highways and protect us from a foreign invasion, and they're not sure about paving the highways. Republicans used to care about such things, but they got all confused when the Gipper told them greed is good.