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For more of our interview with Joel McHale, watch "The Lead with Jake Tapper" on CNN at 4 p.m. ET
(CNN) – Comedian Joel McHale is hosting the White House Correspondents' Association Dinner Saturday, known as one of the toughest gigs in D.C.
But where does he come from? In this web extra, McHale jokes about the "stimulating" work his grandfather did after World War II.