For Obama, it's time for one last laugh at annual Washington dinner

U.S. President Barack Obama will add "comedian" to his resume for a final time on Saturday as he aims to take down the house in his last appearance at the annual White House correspondents' dinner, a night of playful ribbing of both politicians and the news media.

The black-tie event, which Obama has previously joked is "a night when Washington celebrates itself," brings together journalists and media moguls with Hollywood stars and power brokers from Capitol Hill and beyond.

White House hopeful Bernie Sanders, Vice President Joe Biden and International Monetary Fund head Christine Lagarde were among the politicos mingling with celebrities, including actress Emma Watson of "Harry Potter" fame and singer Gladys Knight.

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