"Republicans are on the wrong side of a gender gap" and similar fallacies

[nclib]

Is there some subconscious sexism, the idea that men are treated as the "default" group and so we think of the "male vote" as being roughly synonymous with the overall vote, but the "female vote" as a separate category?

This is the best explanation. Also, given that most leaders (of each party) are male, it can indicate the GOP's failure to appeal to women.