What happens when a man takes over the job of first lady?

It's 2015, and we're back in uncharted territory, testing historic gender boundaries by pondering what it would mean to have a woman in the Oval Office -- and her husband in the East Wing. With Hillary Clinton officially running for president and Carly Fiorina intimating that she may enter the GOP presidential primary, there is the distinct possibility that the nation could soon have a first gentleman in the White House.