First, I know what most of you are going to say. I myself was an internet atheist 20 years ago, quoting Dawkins and Sagan at magic-sky-daddy believers. But this isn't about convincing anyone to believe.
This is about pragmatics. And, pragmatically, the single biggest enemy right now is the conservative Christian right. Anything to fracture that coalition benefits the left.
Luckily, their gospels are pretty left-wing. So, I offer for your consideration, the Christian angle.
I encourage those of you who went to Sunday school to brush up on your Scripture. Matthew is a treasure trove. When you're talking to someone on the right, start hitting them with chapter and verse.
If nothing else, this is initially shocking. They're supposed to be the Christians, and you're some filthy commie reminding them that Jesus called the wealthy priests hypocrites, and told us to feed the hungry and aid the sick.
They have defense mechanisms against your crybaby commie talk. They don't have defense mechanisms against their own scripture. At worst, you shake them loose from their script and confuse them, giving you openings for gentle deprogramming.
At best, they might reflect on their leadership and how closely they follow Jesus' commands. Anyone who really believes in him and really reads the gospels is going to wind up a leftist, whether they call it that or not.
Just food for thought. Read up on what Jesus said, use that against the people who claim to follow him. You don't have to believe yourself to recognize a powerful rhetorical tool.
Luke and Timothy have some good shit in them too