The state dinner dates back to 1874, when Ulysses Grant invited King David Kalakaua of the Kingdom of Hawaii to break bread with him. President Obama's first state dinner will be held for Indian Prime Minister Manmohan Singh and has been the subject of much speculation — Washington is abuzz with details of who will be invited. In an effort to convince the Obamas to diversify their guest list, here's a handful of encounters that may never have occurred without a state dinner.