Glamour's , an all-star roster of athletes teamed up for an important message: vote! The PSA features uplifting words from Nneka Ogwumike, Tatyana McFadden, Billie Jean King, Simone Biles, Lindsey Vonn, Allyson Felix, Elena Delle Donne, Diamond DeShields, Missy Franklin Johnson, Mikaela Shiffrin, and A'ja Wilson. So why is casting your ballot so important? “Because, first of all, we're allowed to vote," says Billie Jean King, tennis icon and activist.