Politics

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Police block off Pennsylvania Ave., from pedestrian traffic in front of the White House as a precaution after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. (Andrew Harnik/The Washington Times)

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An officer can be seen patroling the roof of the White House after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. Police have moved visitors to the north lawn of the White House back across the street as a precaution. (Andrew Harnik/The Washington Times)

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An officer can be seen patroling the roof of the White House after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. Police have moved visitors to the north lawn of the White House back across the street as a precaution. (Andrew Harnik/The Washington Times)

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Students from Bolder, Colo. stand behind police tape after police block off Pennsylvania Ave., from pedestrian traffic in front of the White House as a precaution after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. (Andrew Harnik/The Washington Times)

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President Barack Obama speaks in the James Brady Press Briefing Room at the White House in Washington, Monday, April 15, 2013, following the explosions at the Boston Marathon. (AP Photo/Charles Dharapak)

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Speaker John A. Boehner speaks to President Obama around 5:30 p.m. Monday about the tragedy in Boston. (Courtesy of the House of Representatives)

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President Obama talks on the phone with FBI Director Robert Mueller following explosions at the Boston Marathon. (Pete Souza/White House photo)

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President Barack Obama waves at the end of a ceremony honoring the BCS National Champion University of Alabama Crimson Tide at the White House in Washington, Monday, April 15, 2013. The White House says Mr. Obama has been notified about the explosions at the finish line of the Boston Marathon. (AP Photo/Manuel Balce Ceneta)