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Miller, a Transit Police dog with the Massachusetts Transportation Authority Explosives Detection Unit, watches as commuters enter the subway system at Back Bay Station a day after two explosions near the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. Two bombs packed with ball bearings tore through crowds near the finish line of the Boston Marathon on Monday, killing three people and triggering  a massive hunt for those behind an attack the White House said would be treated as "an act of terror."

Jessica Rinaldi/Reuters

Miller, a Transit Police dog, watches commuters at Back Bay Station a day after two explosions in Boston. Miller, a Transit Police dog with the Massachusetts Transportation Authority Explosives Detection Unit, watches as commuters enter the subway system at Back Bay Station a day after two explosions near the finish line of the Boston Marathon in Boston, Massachusetts April 16, 2013. 

 Volunteers place grave markers on the National Mall as over 3,300 crosses, stars of David, and other religious symbols  are placed to remember those affected by gun violence, on April 11, 2013 in Washington, DC. Clergy from Newtown, Connecticut, and others will begin a 24- hour vigil to urge Congress into passing tougher gun laws.

Mark Wilson/Getty Images

Volunteers place grave markers on the National Mall in Washington on April 11 2013. More than 3,300 crosses, stars of David and other religious symbols were planted to remember those affected by gun violence. Clergy from Newtown, Connecticut, will lead a 24-hour vigil to urge the House of Congress to pass tougher gun laws.

US President Barack Obama speaks on the budget in Rose Garden of the White House on April 10, 2013 in Washington, DC. At right is Office of Management and Budget Acting Director Jeffrey Zients. Obama's budget plan for 2014 is in many ways an academic exercise, given that it has no chance of being fully enacted in stalemated Washington, as Republicans and Democrats on Capitol Hill have already passed rival budgets.

Mandel Ngan/AFP

US President Barack Obama reveals the budget in the Rose Garden of the White House on April 10 2013 in Washington DC. To his right is Office of Management and Budget Acting Director Jeffrey Zients. Mr Obama’s budget plan for 2014 is in many ways an academic exercise, given that it has no chance of being fully enacted in Washington as Republicans and Democrats on Capitol Hill have already passed rival budgets.