Bernie Sanders was an avowed socialist who came within about 10 feet of the Democratic presidential nomination. He'd have won the general, too (assuming he didn't get assassinated which is not guaranteed). We'd have had a socialist as president who spent and still spends all his time railing against wall street and the US's imperialism.
Yes there are a lot of crooked people in the DNC who tried to kill his chances, and ultimately succeeded. That one time.
But the point is he came pretty fuckin' close and your reaction is to yell MOPE MOPE MOPE YOU NEED TO MOPE MORE in my face.
People who fought for real change, civil rights movement Indian independence American labor movement fall of Communism in Eastern Europe, would FUCKIN KILL to have it as easy as progressives in the US do. No, it's not automatic. What do you want, a "make politics better" lever that's right in your living room so you don't have to get off the couch?
Ask Navalny's parents if they'd rather be up against the DNC