Asimov was a convinced atheist but not proselytizing about it. His politics were likely typical of his background, secular New York Jewish intellectual. I remember reading something about his being turned off by Heinlein’s libertarian/militaristic views.
I would be real curious to see what Asimov would say when science intersects politics - i.e. global warming. I remember one essay of his about the global climate - that we were lucky that we had mostly ocean at the high altitudes rather than large land masses, and that you might avert another ice age by sprinkling graphite dust on the glaciers.
I still love his history books and I'm happy I picked up the Chronology of the World. I just didn't know he was so loony left. Just crap!
Next I'll find out that Mortimer J Adler was a leftist too.