You don't, obviously. I used to work at the former house of Judge Henry Faulk, and where John Henry Faulk was born; the birthplace of the genuine Texas yellowdogs. I know exactly what the difference is between a yellowdog Democrat and a bluedog Democrat is. I have John Henry's biography, "The Making of a Liberal Mind". As I am sharing my library so as to not give my kids so much crap to sift through when I pass I would be glad to share it with you. Google "John Henry Faulk" and if you'd think you'd like it, I would be glad to send it to you and I'll pay the couple of bucks postage.
I still identify as a progressive Republican but I can sure recognize a good person even if she/he is a Democrat or Independent.