Sen. Mark Warner works to gather Senate Democrats to ask Biden to exit race The Washington PostWarner Is Working to Convene Democratic Senators to Talk About Biden's Future The New York TimesReport: Democratic senator trying to assemble group of colleagues to urge Biden to exit race The Times of IsraelVa. senator reportedly organizing group to ask Biden to leave presidential race WTOPSen. Mark Warner looks to align Democratic senators amid questions over Biden's future CNN