But there comes a point in the speech where I find my cadence. The crowd quiets rather than roars. It's the kind of moment I'd come to recognize in subsequent years, on certain magic nights. There's a physical feeling, a current of emotion that passes back and forth between you and the crowd, as if your lives and theirs are suddenly spliced together, like a movie reel, projecting backward and forward in time, and your voice creeps right up to the edge of cracking, because for an instant, you feel them deeply; you can see them whole. You've tapped into some collective spirit, a thing we all know and wish for - a sense of connection that overrides our differences and replaces them with a giant swell of possibility - and like all things that matter most, you know the moment is fleeting and that soon the spell will be broken.

A Promised Land by Barack Obama