They probably both have compatible opinions on what constitutes a good person. They might disagree with you on some facets of that, but you’re not who they’re in a relationship with.
OP was likely referring to how conservatives treat women. As in why would a woman date someone who treats women like that? IMO it's because they're too dumb to realize how they are being treated vs how they should be treated.
Because conservatives don't beat women? For everyone talking about the conservative male that dominates and controls his wife, there is a liberal one stoned on marijuana that needs to be babysat.
These are of course the stereotypes for each side, the reality is that there is a wide range of behaviours that has only weak correlation with political views. But everyone here is too severely brain-damaged to be able to determine causal links.