AdvertisementBoycotts Hitting Group Behind 'Stand Your Ground'04:32Download AudioResumeApril 05, 2012Peter OverbyfacebookEmailSelina Gray of Sanford, Fla., shows her sign at a rally protesting the death of Trayvon Martin, the unarmed teen shot by a neighborhood watch volunteer. Authorities have cited the state's "stand your ground" law as a reason charges have not been filed in Martin's death. (AP)