http://www.slate.com/articles/news_and_politics/dispatches/2015/05/death_penalty_in_dzhokhar_tsarnaev_trial_the_two_narratives_that_explain.html

The jurors in the Dzhokhar Tsarnaev trial sped through the questions that decided his fate at the rate of three or more an hour—about enough time to read the question out, take a vote, count the hands, and move on to the next question. Most important, though, the jury appeared to agree unanimously that the 19 mitigating factors proposed by the defense made no difference. If even one juror had found it impossible for any reason to vote for the death penalty, Tsarnaev would have been sentenced to life imprisonment for his role in the Boston Marathon bombing.