'That one' did it.
And like most of us, I'm still in the emotional phase - and in a funny way, perhaps just for today, it is an 'us'. Because Obama's universality and the universality of our interest around the globe in his candidacy, has created - if only momentarily - a community of interest.
Who knows where this may take us. Who knows how long it will last.
But just for a moment it is irresistible to savour the spectacle, the experience, the emotionally buffeting rollercoaster, of history being made. Of history occurring, before our very eyes.
Change certainly can happen. Change has happened.
The cynic in me, the realist it likes to call itself, reminds me of 1997 and tells me that another larger generation may have to grow up disappointed. As the red wedgers of the British 80's grew up when the lies and war crimes of blood red Blair came to haunt their 21st century.
But I can't buy it because, for all that the day may come when President Obama chooses to bomb somewhere back to the nineteenth century, or when a Pashtun wedding party gets atomised by a high level bombing raid on his watch, it won't change the significance of today.
As Justin Webb said last week and indeed last night, when America looks in the mirror it will see a black 'first family'.
He may not be the son of slaves but he hasn't married a white chick either. Michelle Obama and those two daughters might just turn out to be the real signifiers of change as much as their husband and father.