D.C. Prepares for Barack Obama's 2nd Inauguration (Photos)

Katy Perry performs during the Kids' Inaugural: Our Children. Our Future." event in Washington, Saturday, Jan. 19, 2013. (AP Photo/Gerald Herbert)

A presidential vehicle, parked outside the White House in Washington, Saturday, Jan. 19, 2013, sports Washington's "Taxation Without Representation" license plate. (AP Photo/Susan Walsh)

First lady Michelle Obama stains a bookshelf at Burrville Elementary School in Washington, Saturday, Jan. 19, 2013. (AP Photo/Susan Walsh)

Two days before President Obama's second inauguration, a workman snaps a souvenir photo amid thousands of folding chairs awaiting the festivities on the West Lawn of the US Capitol. (AP Photo/J. Scott Applewhite)

A cyclist prepares to pass visitors standing in front of the Inaugural Parade Reviewing Stand outside the White House on Pennsylvania Avenue in Washington, Friday, Jan. 18, 2013. (AP Photo/Susan Walsh)

The official inaugural gifts to be presented to President Obama and Vice President Biden are displayed at a news conference on in Washington on Friday, Jan. 18, 2013. The crystal vases are custom designed and engraved by Lenox. ((AP Photo/J. Scott Applewhite))

House Speaker John Boehner and House Democratic Leader Nancy Pelosi hammer a nail into a plank during the First Nail Ceremony in Washington, Thursday, Sept. 20, 2012.  (AP Photo/Cliff Owen)

Construction continues on the platforms on the west side of the Capitol, looking down Pennsylvania Avenue in Washington, Tuesday, Dec. 11, 2012. (AP Photo/J. Scott Applewhite)

A model of the White House sits on a giant map during a media tour highlighting inaugural preparations. (AP Photo/ Evan Vucci)

Members of The Joint Task Force, National Capital Region, Department of Defense take-part in a dress rehearsal for military participation in the 57th Presidential Inaugural ceremonies at the U.S. Capitol in Washington, Sunday, Jan. 13, 2013. (AP Photo/Cliff Owen)

U.S. Air Force Staff Sgt. Serpico Elliott rehearses taking the oath-of-office as he stands-in for President Obama during dress rehearsal for military participation in the presidential inaugural ceremonies at the U.S. Capitol in Washington, Sunday, Jan. 13, 2013. (AP Photo/Cliff Owen)

A dense fog hangs in the air at The Joint Task Force, National Capital Region, Department of Defense dress rehearsal for military participation in the inauguration, Sunday, Jan. 13, 2013. (AP Photo/Cliff Owen)