The US President was seen across the world drinking a pint of Ireland's liquid gold - so Guinness has a global PR story on its hands. According to Kantar, Obama's trip generated more than $20m of free publicity for the beer brand.
But Guinness isn't the only PR winner. With a lot of hard news breaking around the world, that pint will help soften the image of Obama and keep him in the public's favour. And that is worth a lot more than $20m.
Adam Clyne, commercial director, TVC Group