If you've got 20 minutes to spare (I know, I know!) do watch these two videos from Obama and Clinton as they respond to that result in Iowa a couple of nights ago.
Easy to overstate these things - but don't think I've heard such impassioned oratory as that from Obama for a very, very long time. For me, it's in a whole different league from Clinton's speech. Totally uplifting, positive and forward-looking.
I'm now entirely convinced that if he wins New Hampshire his campaign momentum will be nigh-on unstoppable.
By the way, you may spot on YouTube that over 300,000 people have watched the Obama video; as compared to some 3,000 the Clinton one. Might just say all there is to say?