A Presidential candidate forum focused on Native American issues is underway at the Orpheum Theater in downtown Sioux City. The forum is named after Native American activist Frank LaMere of Siouxland who died in June. Massachusetts Senator Elizabeth Warren, who has been dogged by criticism since her claims of Native American ancestry have been disproved, apologized for her actions. “ I know that I have made mistakes. I am sorry for harm I have caused. I have listened and I have learned . . . a