I think the Kennedy vs. Nixon episode had a lot to do with the Sterling Cooper backing the Nixon campaign. A lot of them would probably go Nixon because they felt it would be like being loyal to a candidate. If Nixon won, his people would ask them back for re-election campaigns. However, a lot of the characters do become more liberal. Look at Season 1, episode 1 Peggy vs. how she is now as an example. Even Roger is becoming more liberal and changing. Before season 5, I had him pegged as a die hard Republican, but now I’m not so sure. Betty, like Trudy Campbell, is definitely a lifelong conservative and I’d bet Burt Cooper is fiscally conservative though he seems open minded by embracing Japanese culture and getting into Atlas Shrugged. Megan seems fairly liberal despite her conservative upbringing. Peggy and Joan seem pretty liberal as well by the end of season 5. Don seems kind of on the fence in my opinion. Pete seems somewhat liberal, but in kind of a phony way, like he’s a closet conservative. He always wants to break new ground and make a name for himself even if it comes at the cost of being disingenuous. Lane’s conservative about practically everything in his life but a lot of that seems to stem from not wanting to upset other people’s lives. Maybe he has dreams and ambitions, but they’re kept at bay in an effort to remain proper and polite. He’s definitely a people pleaser which is why I personally relate so strongly to him more than any of the other characters. The real genius of the show is how much the characters change or attempt to change. Political position is definitely personal choice, but Mad Men also shows how it can be a product of environment and circumstance. I’ve heard people from both sides of the political spectrum complain about the show’s values or messages. I think its characters are among some of the most genuine I’ve ever encountered in literature, TV, or film.