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By Tanya Basu WASHINGTON (Reuters) - At the gathering he jokingly called "a night when Washington celebrates itself," U.S. President Barack Obama took light-hearted aim on Saturday at a range of political friends and foes, including the people running to succeed him. Obama's comedy routine at the annual White House Correspondents' Dinner included a sly dig at Hillary Clinton, the current front-runner to be the Democratic candidate in the 2016 presidential election. Noting that some Americans are living in a time of uncertainty, Obama said, "For example, I have one friend just a few weeks ago, she was making millions of dollars a year and she's now living out of a van in Iowa." Clinton, who as a former secretary of state, former senator and former first lady is one of America's best known figures, traveled around in a van this month in a deliberately low-key trip to the state that holds an early contest in the election primary season.