The president commuted the sentences of 37 of 40 men on federal death row. He left out those accused of hate crimes and terrorism, including Tsarnaev. One 2013 Marathon runner was relieved: 'If he lets him off,

Tsarnaev was convicted of all 30 charges against him, including conspiracy and use of a weapon of mass destruction and the killing of Massachusetts Institute of Technology Police Officer Sean Collier during the getaway attempt. Prosecutors said the brothers carried out the attack to punish the U.S. for wars in Muslim countries.