
Rep. Niki Tsongas, Massachusetts Democrat (AP Photo/Michael Dwyer)

Rep. Niki Tsongas, Massachusetts Democrat (AP Photo/Michael Dwyer)

Neil Diamond sings "Sweet Caroline" in the eighth inning of a baseball game between the Boston Red Sox and the Kansas City Royals at Fenway Park in Boston on Saturday, April 20, 2013. (AP Photo/Michael Dwyer)

Neil Diamond sings "Sweet Caroline" in the eighth inning of a baseball game between the Boston Red Sox and the Kansas City Royals at Fenway Park in Boston on Saturday, April 20, 2013. (AP Photo/Michael Dwyer)

FBI agents look up at a building during a search for a suspect in the Boston Marathon bombings on Norfolk Street in Cambridge, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Michael Dwyer)

Massachusetts Gov. Deval Patrick (right) greets marathoners Rick Hoyt (below) and his father, Dick, before the ceremonial first pitch in a baseball game between the Boston Red Sox and the Kansas City Royals in Boston on Saturday, April 20, 2013. (AP Photo/Michael Dwyer)

Massachusetts Gov. Deval Patrick (right) greets marathoners Rick Hoyt (below) and his father, Dick, before the ceremonial first pitch in a baseball game between the Boston Red Sox and the Kansas City Royals in Boston on Saturday, April 20, 2013. (AP Photo/Michael Dwyer)

Boston Red Sox's Pedro Ciriaco wears a 'B strong patch during a baseball game between the Boston Red Sox and the Kansas City Royals in Boston, Saturday, April 20, 2013. (AP Photo/Michael Dwyer)

Boston Red Sox's Pedro Ciriaco wears a 'B strong patch during a baseball game between the Boston Red Sox and the Kansas City Royals in Boston, Saturday, April 20, 2013. (AP Photo/Michael Dwyer)