This fall’s presidential election could lead to a historical first when it comes to first ladies. A former first lady could be elected president – bringing about another new distinction: a first gentlemen. We could also have the first foreign-born first lady since Louisa Adams. This hour, as we broadcast from NPR Headquarters in Washington, we’ll talk about the many roles first ladies have served in the White House with Kate Andersen Brower. She’s the author of “First Women: The Grace and Power of America’s Modern First Ladies” (Harper).