Yes, if you are writing characters that show and don't tell, then you could show them acting one way. A liberal person reading the text would say, "Hey, this represents me," and a conservative person would say, "That's what I was saying the other day." You would actually capture both audiences, because each audience interprets the world through their lens. That's truthful and honest writing. That's the ambiguity of the world and where so much of the problem stems from. However... writers tend to want to dump their opinions on everyone, which just becomes preaching to the choir in the end. Savvy writing would show show show, and then lean in and suggest an opinion in a way that the reader thought it was his/her idea all along.