"The Trouble" is that in some fabled, wholly-imaginary past, people who were from different ideologies didn't date because we all had principles, dammit!
James Carville was Bill Clinton's campaign strategist in 1992. Mary Matalin was George H Bush's campaign strategist that same year. They married in 1993. And back then? When we're all "WTF yo!" they said "we don't discuss politics at home" and we were all "k" and moved the fuck on.
I mean I'm being tongue in cheek. It's really the New Yorker asking how it can write a story about a doofus dating someone way more hip than he is. I think I totally checked out mentally when they described her clothes.