AdvertisementDemocrats are having a unity problem. That's familiar territory for themOctober 10, 2021Ron ElvingfacebookEmailAs the White House tries to try to move forward on agenda items, moderate Democrats Sen. Kyrsten Sinema, D-Ariz., and Sen. Joe Manchin, D-W.Va., have emerged as key players. They have clashed with party leaders and progressive members. (The Washington Post via Getty Images)