There were a couple more. At the start of the pilot episode, when Rick and Shane were together in the cop car, Shane related a girlfriend's angst about global warming.
Lori is---or was----against the death penalty.
Jenner, the CDC doctor, exclaimed that it was silly for the world to depend on fossil fuels. And the French---the French!---were the heroes of the world, who stuck it out doing research into the cause of the zombie plague after everyone else had ditched it, LOL.
I just figure anything made in Hollywood is going to be stamped with the liberal mindset.