Counter-intuitively, my parents have stayed happily married for a very long time and my dad is significantly more conservative than my mom (although my mom has become more "conservative" in the current decade in reaction to how extreme rhetoric on the left has become in the US). I am about to propose to my long-time partner who is significantly more to the left than I am (we are both to the left, I'm barely left of c…
Yes, and it's more than just politics. In any marriage, someone will be more conservative, and someone will be more liberal. But also, someone will be more fiscally conservative, and someone more willing/eager to spend. Someone will be more of a morning person, and the other more of a night owl. Someone will be more extroverted and social, and the other more of an introvert. Someone will be more athletic and outdoors…
Just so. This is also true of friendships as much as it is romance, and nobody much likes being friends with someone who is domineering and zealous. Agreeableness is a useful trait in relationships of every type and for many farther reaching cases than simple politics. I think that politics /might/ be becoming a more strict relationship divider in our current times, but is is less to do with politics, and more to do with the lack of agreeableness amongst people.