From Slate:

I am in Des Moines but in the bubble. On the flight out here nearly everyone on the plane seemed to be reading poll numbers or political magazines. As I eat my burger, I can hear the woman at the next table talking about the White House Correspondents Dinner. Cameramen at another table tell stories about padding their expense reports. The woman in the corner praying into her BlackBerry works for one of the networks, I think. On my way back to my room, I run into Joe Klein coming in off the road. I'm going to go up and check if they've put a volume of Teddy White in the bedside table.

Christina Bellatoni also sheds some light on life on the road.