Given the powerful grief and anger over the Boston Marathon bombing, Boston would seem to be a particularly hostile place for Dzhokhar Tsarnaev to stand trial. But it might just be his best hope of escaping a death sentence. Opposition to the death penalty runs deep in liberal Massachusetts. In a Boston Globe survey in September, 57 percent of Massachusetts residents polled favored life in prison for Tsarnaev, while 33 percent favored execution. As Tsarnaev's lawyers weigh whether to attempt to move his trial out of town, away from those most deeply traumatized by the bombing, some legal experts say...