She’s there in place of her husband.
Look at the reaction of the athletes.
Usually, it’s no Brainer for the President or the First Lady to represent the American People at the Olympics. But they made it political. Kerr and Curry just announced their support for Kamala Harris. That was while they’re representing the men’s national basketball team. If they wanted to do it the right way, they have the freedom to endorse Kamala Harris when they’re at home in California “off the clock”.