There’s been a lot of anxiety over how Democrats should appeal to men or face certain defeat. But not everyone is worried.

The U.S. House of Representatives has passed a bill banning transgender girls and women from competing in women’s school sports, with Republicans at the forefront.

At the beginning of the current Congress, there were 125 women in the House (29% of all representatives) and 25 in the Senate (25% of all senators). Women make up the same share of each chamber as ...