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WASHINGTON, DC - JANUARY 21: Musicians John Mayer and Katy Perry attend the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC. Barack Obama was re-elected for a second term as President of the United States. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JANUARY 21:  Musicians John Mayer and Katy Perry attend the presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington, DC.   Barack Obama was re-elected for a second term as President of the United States.  (Photo by Alex Wong/Getty Images)