the president and his aides are even musing -- remember during the transition after he won he engaged in the thank you tour. a similar model here. a sort of not guilty tour if you will, where he might do some barnstorming during the trial and then afterwards to celebrate the fact that he survived impeachment. >> aircraft buffs will instantly notice the smaller 757 tonight being used as air force one. smaller than its 747 cousin for the trip out to michigan and back. also another way of saying -- these are live pictures -- the president has arrived back at andrews. short helo ride to the south lawn on a windy night in washington. with our thanks to our panelists tonight, nancy cook, mara gay, and jonathan lemire, all of whom had longer than average days on the job today. we appreciate it. coming up, it is hard to estimate the gravity of this day, what it means for all of us and the legacy of our 45th president. luckily for us we have a pulitzer prize-winning historian