not the original poster, but yeah, bernie sanders proposal are seen as common, almost bipartisan, in Europe

In Europe we would actually call him a ‘Social Democrat’, albeit a left leaning social democrat. Social Democratic parties are really popular in Europe. I think of them people that are really into equality (though not always when it comes to immigrants, refugees, and climate policy) but also favor capitalism. Bernie Sanders actually goes further in his social policies than many run-of-the-mill social democrats in Europe, which is why he would be left leaning.

I consider Social Democracy to be a rather confused ideology. But in Europe it is immensely popular. What is probably different is that capitalism is extremely popular in Europe, and in many ways Europe goes harder on free markets than even the USA, even trying to solve the climate crises with some capitalistic cap-and-trade scheme (Americans can think of western Europe as an extreme version of California).

In the USA, capitalism is only popular among the rich (and subsequently politicians). Politicians on both sides of the aisle are more focused on social issues (as are voters) so capitalism remains an unasked question when it comes to the polls. When you talk to a random economically informed working class person in Europe, chances are they favor capitalism. In America however (at least on the West Coast where I live) you’d be hard pressed to find a working class person that likes capitalism. However in the USA the social issues are so glaring that most voters seem to be OK with voting for a capitalist just to prevent a fascist getting power. In Europe this would be unthinkable.

This is why it is actually a bit confusing to put Bernie Sanders on the European political spectrum, because in Europe he actually would be a run-of-the-mill politician (albeit a bit left). In the USA, he is spectacular.