To get the basics of welfare the US has now, it took 25% of the country being unemployed,, everyone seeing their hard working grandparents dying in the ditch at the end of their life with nothing, and constant bread lines everywhere.
Oh, and massive organization of voters and rabid progressive populist support.
President Trump, above all, is the clearest and most direct example of how you absolutely can get what you vote for in the US. Republicans did not want Trump and fought it as much as they could. They openly declared how bad he was and how stupid and how awful he would be, and it didn't matter. Because people voted.
Donald Trump is in flagrant violation of constitutional law constantly, again, and it doesn't matter because voters want it.
He should be in prison but it doesn't matter because voters wanted him, wanted his bullshit, and voted against anyone who got in their way.
And yet, losers will STILL insist that "voting doesn't matter" or "Blah blah money in politics"
All you gotta do is vote people.
There's also a propaganda feedback loop. It's not like Trump's voters are innocent, though. They want to be told lies.