It's Manny Garcia - a freelance photojournalist based in Washington D.C.. I think!
This is a separate frame of the photograph from which Fairey's Obama image was taken. Who knew George Clooney would figure in the story! (In April 2006, Clooney was joined by then Senator Obama as he was addressing the National Press Club on his recent visit to Darfur.)
The credit for this discovery goes to Philadelphia Inquirer photographer Tom Gralish. Here's his account.
I just spoke to Garcia who is currently on White House duty, but by next week expect to see Garcia's print in my exhibition CAN & DID. GRAPHICS, ART, AND PHOTOGRAPHY FROM THE OBAMA CAMPAIGN.
What would we do without the internet!