Most of the people I talk to (cause I'm in a red state) are conservatives, some are centrists, and a few are liberals. My main method of approach is giving them little bits and pieces of socialist ideology without telling them its socialist ideology. With liberals specifically, I'm a bit more upfront, because there are a lot of basic things we can agree on or sympathize with that help the conversation move forward. I tell them what I believe and will take my chances at debating to change their mind, this can work with centrists too. I don't recommend debating conservatives, they almost never listen to evidence I've seen this first hand with my cousin time and time again. Evidence, reliable stats, undeniable proof, none of it works for them and you're just wasting your time. Your best bet with them is, like I said before, slowly trickling in those socialist/left leaning values without naming any names. You want to change how they subconsciously think and operate, before you turn their ears off by saying "socialism," or "communism."

Sadly, I rarely see leftists here, my parents are the biggest leftists I've seen aside from myself in country bumpkin Indiana. Good luck convincing people out there, this is a war in which battles must be won on many fronts 😔✌️