Minority voters in Gwinnett County can’t elect local candidates of their choice because of unfairly drawn political districts, advocacy groups say, and they want a federal judge to order changes. The lawsuit filed Monday could have significant implications for Gainesville as the Latino population grows locally. “What we’re asking for is the elimination of at-large voting, as well as a total redrawing of all of the maps,” said Jerry Gonzalez, executive director of the Georgia Association of Latino Elected Officials.