NBC Nightly News anchor Brian Williams cruised up a few blocks and switched network to guest last night on the Late Show with David Letterman.

BriWi (obligatory Rachel Sklar shout-out) talked about his hosting gig on SNL ("I'm still having the clothes laundered that I wore"), the way the world views America and the experience of moderating a debate. "We don't feed Tim for 36 hours before," Williams said of his usual, "jumpy," debate partner, Tim Russert.

Click continued to see Williams explain more about how he keeps Russert in check during debates...