DENVER—Michelle Obama didn't have to mention Hillary Clinton in her speech tonight. She didn't have to give a nod to the 18 million votes that Clinton received in the primary, or the 18 million cracks in the glass ceiling. But she did (and to huge cheers). She could have just spoken generically about party unity, but instead she gave a hat tip to Clinton and risked igniting the passions of Clinton loyalists. And it wasn't just for the sake of party unity. Both Clinton and Barack Obama are historic candidates and Michelle Obama's mention of Clinton was her own way of saying "you go girl'. And obviously, this year Michelle would rather have the first African-American president of the United States but she is also a woman and I think would have been proud to also have the first female president of the United States. We can only have one first this year and everyone in the United States should be proud to have the first African-American nominee of a major party. Maybe next time we'll get our next first, the first female presidential nominee of a major party.