AdvertisementAnalysisHow Biden Won: Ramping Up The Base And Expanding Margins In The SuburbsNovember 18, 2020Domenico MontanaroConnie Hanzhang JinfacebookEmailResidents of Gwinnett County in Georgia hold Biden-Harris campaign signs on Election Day in Norcross, Ga. President-elect Joe Biden ran up the margins in Atlanta's diversifying suburbs. (Getty Images)