mixing and matching your covid vaccines. experts also now tracking a new delta variant spinoff, but so far they see no reason for alarm. and virginia's terry mcauliffe gets a little help from his friends. tonight vice president harris tries to rally the democratic base. saturday former president obama hits the trail, this as the polls show that governor's race in virginia neck and neck. we begin though with the president. tonight he'll step up his efforts to sell his sweeping agenda directly to you, the american people, taking questions from voters at a cnn town hall live in baltimore. it is a fascinating and consequential moment. it is hard to sell a package that is still tbd because of big differences in the democratic family so as the president tells the voters asking the questions and those of you watching at home he'll also be trying to sell his favorite pieces of the plan and persuade democratic lawmakers it is time to make the tough decisions needed to make a deal. the president's first year scorecard and his long-term legacy hang in the balance. so do the narrow democratic majorities in the house and the