U.S. President Barack Obama joked about his approval ratings at the White House Correspondents' Association dinner.The dinner in Washington, was attended by leading Hollywood celebrities and some of America's most powerful politicians.Obama competed for laughs with U.S. late-night TV comedian Jay Leno, who told jokes at the dinner. Other celebrities at the event included film director Steven Spielberg, actors Morgan Freeman and Alec Baldwin and singer Jessica Simpson.Obama ribbed among others Vice President Joe Biden, unsuccessful 2008 Republican presidential candidate John McCain and Goldman Sachs Group Inc. Obama said he had not been sure he should attend the dinner, but Biden talked him into it.
