US national team fans, believe.
Believe, because US women's national team stars Abby Wambach and Hope Solo tell you to. Believe, because Jimmy Kimmel, Whoopi Goldberg, Jon Hamm, and Ice Cube tell you to. Believe, because NBA and NFL stars Rajon Rondo and Cam Newton tell you to.
And if that's not enough for you, believe because Mad Men's Don Draper — also known as Jon Hamm — pitched it to you.