I don't know that they issue a TFR every time they fly into and out of the White House. Much of that is restricted and prohibited areas on a regular basis. Last month when I was spotting at DCA, there was a pause in traffic (no more than 5 minutes) and I saw the three Marine white tops across the river heading towards the White House. That was the second time in recent months I've been in DC, saw the helicopters, and had the wrong lens on the camera, although this one turned out OK...
http://www.moose135photography.com/A...ne1_001-XL.jpg
You might be able to check the President's public schedule here: http://www.whitehouse.gov/schedule/president/
A sample from his overseas trip in July:8:50 PM The President and the First Family arrive Joint Base Andrews
9:15 PM The President and the First Family arrive the White House