When I first saw this picture yesterday, from the AP’s Alex Brandon, I almost burst into tears and sat staring at it for a long time trying to contain myself. Have you ever seen such joy, and did you imagine, in your lifetime, that you’d ever see children and teenagers responding with such elation to a politician? Not a movie star. Not an athlete. But a politician.

It’s not hard not to believe when you look at that photo that great things are ahead for America with a generation of kids becoming so politically turned on, and feeling as though their generation matters to a politician.