Two vigils honoring victims of Monday's bombings in Boston attracted hundreds of mourners Tuesday night. Holding candles and flowers, several hundred people gathered in the Boston Commons, where an a cappella chorus sing the National Anthem and God Bless America. In Dorchester, miles from the city, hundreds paid tribute to 8-year-old Martin Richard, who was killed in the attack. A priest called him a "beautiful and gentle soul," and neighbors remembered the cheerful young boy. President Obama is scheduled to arrive in Boston on Thursday to attend a commemorative event.