Charles Dharapak / AP
President Barack Obama and first lady Michelle Obama drink Guinness beer as they meet with local residents at Ollie Hayes pub in Moneygall, Ireland, the ancestral homeland of his great-great-great grandfather, Monday, May 23.
Another head of state, Queen Elizabeth II, turns down a pint of the black stuff: Stiff upper lip, with Guinness moustache, just wouldn't do
Hamlet celebrates its most famous great-great-great grandson. NBC's Norah O'Donnell reports.