Former Obama administration official Rosie Rios, who chairs the taxpayer-funded America250 commission overseeing next year's semiquincentennial celebration, tapped to help organize the festivities a left-wing nonprofit which has been the driving force behind efforts to remove Christopher Columbus memorials and cancel the federal holiday honoring the famed explorer. The National Congress of American Indians (NCAI) has also spearheaded efforts to rename the Washington Redskins football team and