WASHINGTON (Reuters) – Was it just another slip of the tongue by Vice President Joe Biden, or a preview of the next presidential campaign in 2016? Hours before he and President Barack Obama were due to be sworn in for their second four-year terms, Biden told supporters at the Iowa State Society inauguration ball late Saturday: "I'm proud to be president of the United States." The audience laughed and then cheered. Biden's son Beau, Delaware's attorney general, interrupted his father and told the crowd he had misspoken. …

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