There's a really unique relationship between a single parent and their child. Marriages so easily break up. There's kind of this temporary deal about marriages. That's one of the things that makes it stressful and that's something that's nonexistent in a parent-child relationship.
The term 'the American Left' is as near to being meaningless or nonsensical as any term could really be in politics. It isn't really a force in politics anymore. And it would do well to ask itself why that is.