President Nixon had to resign after a corruption scandal and he motioned out his official photographer not to photograph the TV broadcast of his speech.
The “beauty” of protocol photography when Obama administration lets photographers do their work for a SHORT time. Photographers and cameramen had a ten second opportunity to fight in front of a window for a shot of the president working at his desk.
Some new photos taken with a 5D mark III appeared among the official photos of the White House. It seems the official presidential photographer of Obama got some new toys.