USA : Protesters rally in New York , Denver , Baltimore and Detroit . NEW : ` ` If it can happen to her husband , it can happen to anybody 's son or daughter , '' says one . Obama urges ` ` calm reflection , '' asks people to reflect on toll of gun violence . Leaders call for protests to remain peaceful , and for change .
NEW : Protesters rally in New York , Denver , Baltimore and Detroit . NEW : `` If it can happen to her son , it can happen to anybody 's son or daughter , '' says one . Obama urges `` calm reflection , '' asks Americans to reflect on toll of gun violence . Leaders call for protests to remain peaceful , push for change .