George Clooney (Getty Images)

View Photo Gallery: President Obama and first lady welcome British prime minister David Cameron and wife for a state dinner at the White House.

Other actors: Hugh Bonneville, who plays the Earl of Grantham on PBS hit “Downton Abbey.”, and Elizabeth McGovern, the American actress who plays his wife. And Idris Elba, the British actor who mastered a Baltimore accent as Stringer Bell on “The Wire, ” which may be even more popular in England than it is here. Also, “Wire” co-star Wendell Pierce, known his advocacy work on behalf of New Orleans recovery. — though it seems he’s there tonight as Gwen Ifill’s escort.

Warren Buffett (Associated Press)

Carey Mulligan (Getty Images)

A fair number of journalists: British-born Richard Wolffe and Andrew Sullivan, and our colleague Jonathan Capehart.

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President Obama welcomes British Prime Minister Cameron to White House for meetings, state dinner