Hurricane Sandy Slams Washington, D.C. -- PICTURES

With the Capitol in the background, a large fallen oak tree lies on the National Mall near the Smithsonian, Tuesday, Oct. 30, 2012, after Hurricane Sandy passed through Washington.  ((AP Photo/J. Scott Applewhite))

Nadia Zaki, 10, of Washington, looks at tree debris and trash flowing down the swollen Potomac River at the Georgetown Waterfront on Tuesday. (AP Photo/Jacquelyn Martin)

President Obama speaks during a visit to the Disaster Operation Center of the Red Cross National Headquarters to discuss Hurricane Sandy, Tuesday, Oct. 30, 2012, in Washington.  ((AP Photo/Pablo Martinez Monsivais))

A cyclist rides past a wind-blown traffic sign in downtown Washington near the still under construction Smithsonian National Museum of African American History and Culture, Tuesday, Oct. 30, 2012, on the morning after Hurricane Sandy passed through the nation's capital.    (AP Photo/J. Scott Applewhite)

The Potomac River is swollen and filled with debris along the Georgetown waterfront on Tuesday, Oct. 30, 2012.  ((AP Photo/Jacquelyn Martin))

Nadia Zaki looks at tree debris and trash flowing down the swollen Potomac River in the Georgetown waterfront neighborhood of Washington after Hurricane Sandy impacted the region, on Tuesday, Oct. 30, 2012.  (AP Photo/Jacquelyn Martin)

Jeff Stomel loads his car with bottled water in an alley between U Street and Willard Street NW, where tree branches fell on cable lines and a car during Hurricane Sandy, in Washington, on Tuesday, Oct. 30, 2012.  (AP Photo/Jacquelyn Martin)

A jogger passes a large oak tree on the National Mall, Tuesday, Oct. 30, that fell as Hurricane Sandy passed through Washington.  ((AP Photo/J. Scott Applewhite))

Hurricane Sandy left remnants of storm damage outside of the U.S. Capitol grounds in Washington, D.C. on Tuesday, Oct. 30, 2012. (Rick Bloom)

Crews clean up fallen trees on Independence Avenue near the Lincoln Memorial in Washington, D.C., in the aftermath of Sandy on Tuesday, Oct. 30, 2012. (Rick Bloom)

A tree downed by Sandy in Washington, D.C., Tuesday, Oct. 30, 2012. (Rick Bloom)

Shops on M street in Georgetown in Washington, D.C. remain boarded up on Tuesday, Oct. 30, 2012, a day after Hurricane Sandy blew by.  (Chet Susslin)

North-bound Rock Creek Parkway in Washington, D.C. was closed the morning of Tuesday, Oct. 30, 2012, due to storm damage from Hurricane Sandy.

Students at Howard University returning from lunch brave the wind and rain of Hurricane Sandy as the storm arrived in Washington on Monday. (AP Photo/J. Scott Applewhite)

This handout photo provided by the White Houae shows President Obama receiving an update on the ongoing response to Hurricane Sandy, in the Situation Room of the White House in Washington. (AP Photo/Pete Souza, White House)

Workers roll out drain cleaning equipment Monday to keep the Capitol grounds as dry as possible. (Chet Susslin)

The Capitol Dome is reflected in rain drops on the east side of the Capitol building on Monday. (Chet Susslin)

Trees and debris float down the swollen Potomac River on Tuesday, Oct. 30, 2012 at the Georgetown Waterfront in Washington, D.C. after Hurricane Sandy swept through the area.  (Chet Susslin)

Sandbags surround a grate the leads to the Metro system's Smithsonian stop on Independence Avenue Monday. (Chet Susslin)

Pennsylvania Avenue at 13th Street was virtually deserted due to the U.S. Government being closed as Hurricane Sandy arrives in Washington, D.C., Monday. (Richard A. Bloom)

Windows are boarded up to prevent damage from Hurricane Sandy at Papyrus on Wisconsin Avenue in Georgetown. (Richard A. Bloom)

Workers place sandbags along K St. in Georgetown, Washington, D.C.,  Monday morning, October 29, 2012, in anticipation of Hurricane Sandy's arrival. (Richard A. Bloom)

Water barriers are up at the Georgetown Waterfront in preparing for wind and high water levels from Hurricane Sandy on Monday, Oct. 29, 2012. (Richard A. Bloom)

President Obama steps off Air Force One upon his arrival at Andrews Air Force Base, Md., Monday, Oct. 29, 2012. The president flew back from Florida after canceling a morning campaign rally in Orlando to return to Washington to monitor the preparation for early response to Hurricane Sandy. (AP Photo/Pablo Martinez Monsivais)

The U.S. Capitol and Pennsylvania Avenue are seen Monday morning, Oct. 29, 2012, as heavy rain from Hurricane Sandy arrives in Washington. Sandy strengthened before dawn and is on a predicted path toward Washington, Baltimore, Philadelphia and New York — putting it on a collision course with two other weather systems that would create a superstorm.  (AP Photo/J. Scott Applewhite)

A lone man wearing a rain poncho walks past the White House in Washington, Monday, Oct. 29, 2012, during the approach of Hurricane Sandy. (AP Photo/Jacquelyn Martin)

President Obama boards Air Force One at Orlando International Airport, Monday, Oct. 29, after canceling a morning campaign rally in Orlando to return to Washington to monitor the preparation for early response to Hurricane Sandy. (AP Photo/Pablo Martinez Monsivais)

District of Columbia Department of Public Works worker Anthony Jonel (center) carries a sandbag from a container, to be handed out free to District of Columbia residents in Washington, Sunday, Oct. 28, 2012, ahead of Hurricane Sandy. (AP Photo/Manuel Balce Ceneta)

District of Columbia Department of Public Works worker Donald Jackson (right) passes a sandbag from the line of fellow workers handing out free sandbags to District of Columbia residents in Washington, Sunday, Oct. 28, 2012, ahead of Hurricane Sandy. (AP Photo/Manuel Balce Ceneta)

President Obama pauses before speaking to the media at the National Response Coordination Center at the Federal Emergency Management Agency (FEMA) headquarters in Washington, on Sunday, Oct. 28, 2012. FEMA is coordinating the deployment of federal resources in preparation for Hurricane Sandy. (AP Photo/Jacquelyn Martin)

President Obama speaks during a briefing at FEMA headquarters in Washington, with FEMA Administrator Craig Fugate, at right, on Sunday, Oct. 28, 2012. FEMA is coordinating the deployment of federal resources in preparation for Hurricane Sandy. (AP Photo/Jacquelyn Martin)

President Obama (left) listens as Federal Emergency Management Agency administrator Craig Fugate speaks to the media at FEMA Headquarters in Washington, on Sunday, Oct. 28, 2012. (AP Photo/Jacquelyn Martin)

President Obama speaks to the media about Hurricane Sandy at FEMA Headquarters in Washington, on Sunday, Oct. 28, 2012. FEMA is coordinating the deployment of federal resources in preparation for Hurricane Sandy.  (AP Photo/Jacquelyn Martin)