So, who might be taking photographs in the room? It appears that invited guests are banned from bringing their phones into the room. Congressmen obviously have cellphones with cameras. There is also a press gallery filled with 90+ pre-approved photographers and reporters that got a ticket to be at the SOTU. To be in the press gallery with a camera, still or video, you are probably on this list:
https:// www.whnpa.org/main/member-directory/
Kenneth Somodevilla from Getty Images is on this list. Did any other photographer on this list take a similar picture? Were any congressmen taking photos with their cellphones?
Lots of leads to follow!