Okay, so humor me. Let's delve deep into the comic book characters' politics.
1. Batman is a Democrat
Batman is not sexist either. It doesn't matter if you're a man, woman, or transvestite, if you are an evil super villain he will punch you in the face.
2. Spider-man is a Democrat
Okay, this one is a bit more obvious. Growing up in a middle-lower class family. Being taught that if you can, you should always help other. It's no duh that Spider-man is a democrat. He even goes to a school that's big on activism and rallying (Berkeley, perhaps?). He grew up in New York, believing fully in science (he ain't no creationist, bitches). I think we can continue without any controversy on this one.
3. Lex Luthor is a Republican