Progressives are constantly checking their “white privilege,” but what about ideological privilege? Particularly for women, the prevailing assumption is that you aren’t normal unless you’re a liberal Democrat. Conservative women aren’t only left out, but increasingly stigmatized.

Women’s magazines and news outlets depict women who vote Republican as deviants. Vogue headlined a postelection commentary “Why Do White Women Keep Voting for the GOP and Against Their Own Interests?” The Guardian asked: “Half of White Women Continue...