Earlier this month, U.S. women’s national soccer team midfielder Megan Rapinoe appeared with Hillary Clinton in New York City at an “Equal Pay Day” event. The U.S. women’s team has won three World Cups and four Olympic gold medals since 1990. The men? They failed to qualify for this year’s Olympics and haven’t gotten past the quarterfinals in the World Cup since 1930. “Yet somehow,” Mrs. Clinton said, “the men are making hundreds of thousands of dollars more than our women.”

This would be outrageous if it were true. But it...