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Sea of red, white and blue fills the National Mall

Chris Usher / EPA

A group of people on the National Mall react as President Barack Obama is ceremonially sworn in for a second term as the 44th President of the United States in Washington, D.C., on Jan. 21.

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Quinnette Ellis from Tampa Bay, Fla., stands with flags near the U.S. Capitol building on the National Mall after the Inauguration ceremony on Jan. 21 in Washington, D.C.

Shannon Stapleton / Reuters

People cheer on the National Mall during the ceremonial swearing-in ceremonies on the West front of the U.S. Capitol in Washington, D.C., on Jan. 21.

Eric Thayer / Reuters

Spectators react on the National Mall during the 57th inauguration ceremony for President Barack Obama and Vice President Joe Biden on the West front of the U.S. Capitol, in Washington, D.C., on Jan. 21.

Drew Angerer / EPA

Flags fly as the crowd on the National Mall cheers during inauguration ceremonies on Jan. 21.

Joe Raedle / Getty Images

Gustavo Cinfuentes, left, and Greg Josken listen as President Barack Obama speaks during his public swearing-in ceremony as they stand on the National Mall during the Inauguration ceremony on Jan. 21 in Washington, D.C.

Mario Tama / Getty Images

Revelers celebrate in front of the Washington Monument near the U.S. Capitol building on the National Mall while attending the public inauguration ceremony on Jan. 21 in Washington, D.C.

Mario Tama / Getty Images

People gather near the U.S. Capitol building on the National Mall while attending the public inauguration ceremony on Jan. 21 in Washington, D.C.

Pete Marovich / EPA

Spectators arrive for the inauguration ceremonies of President Barack Obama in Washington, D.C, on Jan. 21.

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Festivities for President Barack Obama's second inauguration.