If you claim to represent the working class, and your positions don't resonate with the working class, then you probably aren't representing them very well. If you claim to represent them but you hold most of them in contempt, then you almost certainly aren't going to represent them well.
You say they're all Republicans? Find out why. Find out why the Republicans are able to talk to those people - who are supposed to be your people - better than you can. Then figure out how to talk to them better than the Republicans can (hopefully with more truth and less nonsense).
I'm not asking you to let go of your principles. I'm asking you to live them. Your principles include caring about the working class, the lower class. Go live that out. Go be who you claim to be, who you've always supposed to have been.
If you think that's condescension, then I don't know what to tell you.