President Barack Obama designated April 9 as National Equal Pay Day, even though 70 percent of White House staffers in the top-salary bracket were men, and male White House staffers earn on average 13 percent more than female staffers. “To grow our middle class and spur progress in the years ahead, we need to address longstanding inequity that keeps women from earning a living equal to their efforts,” Obama said in the proclamation released Monday evening. “That is why I have made pay equity a top priority—from signing the Lilly Ledbetter Fair Pay Act days after I took office to...