MIT economist Jonathan Gruber, right, is sworn in prior to testifying before a House Oversight Committee health care hearing in December, 2014. (AP Photo/Molly Riley)
Meb Keflezighi, of San Diego, Calif., runs during the 118th Boston Marathon with the names of those killed in the 2013 bombings, and the MIT officer allegedly slain by the bombing suspects, on his bib, Monday, April 21, 2014, in Boston. Martin Richard, Krystle Campbell and Lu Lingzi, were killed in the bombings, while MIT officer Sean Collier was allegedly shot to death by the bombing suspects. (AP Photo/Steven Senne)
Vice President Joseph R. Biden speaks at Wednesday's memorial service for fallen MIT Officer Sean Collier, fatally shot during the manhunt for the Boston Marathon bombers. With bagpipes wailing, the line of mourners stretched for a half-mile.
President Obama announces in the East Room of the White House in Washington March 4, 2013, he will nominate, Gina McCarthy to head the EPA; MIT physics professor Ernest Moniz for Energy Secretary; and Walmart Foundation President Sylvia Mathews Burwell to head the Budget Office. (Associated Press)
President Obama announces his choices (from left) of MIT physics professor Ernest Moniz for energy secretary, Gina McCarthy to head the Environmental Protection Agency, and Wal-Mart Foundation President Sylvia Mathews Burwell to head the Office of Management and Budget during a ceremony Monday in the East Room of the White House. (Associated Press)