Watch: The 57th Presidential Inauguration

President Obama is sworn in for his second term

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Barack Obama will be sworn in today for his second term as President of the United States, and the White House is providing a live stream of the inauguration. Vice President Joe Biden will also be sworn in today. Tonight's inaugural balls feature performers including Katy Perry, Usher, Alicia Keys, Soundgarden, Stevie Wonder, Fun. and more.