Well, it is a press conference and they could very well have some lighting set up in various spots around the stage. Photoshopped or not, the view form the stage of one of the press conferences would look enough like this that it would still give me nightmares.
The photogs are all in the same small area with the light hitting them from the same direction. I'm enough of an amateur photographer that I can say that the inconsistencies in that image just leaped right out at me. If I posted that on one of my photography forums, the first comment will be "It's a really bad collage."