A good article in Slate notes the fall of Ann Coulter and postulates why:
[New York magazine’s Anne] Lowrey thinks Coulter is pretty much an act that’s gone sour in the age of polarization and she may be right. She compares her to Donald Trump (who Coulter extols for his “immigrants are rapists” comments, which she believes he got from her) and there is a certain kind of scary-clown aspect to both of them. But I think it’s something else — she just isn’t all that shocking anymore. And the reason is that, after all these years — through which she and her fellow right-wing bomb throwers have been poisoning the discourse and polluting our politics with the most egregious dehumanization of just about everyone on the planet who doesn’t look and sound like them — nobody is listening anymore.
Today, Ann Coulter is just political white noise. Sure, she’ll sell her books to the small group of people who can’t get enough of her bilious humor and hatred but her days of being a mainstream pop culture phenomenon are over. Everybody’s heard it all before. There’s almost a whiff of noxious nostalgia about it now.
Read the whole thing