▁candidates ▁( there ▁was ▁a ▁" secret ▁ball ot " ▁earlier ▁in ▁the ▁day ▁so ▁deleg ates ▁for ▁the ▁losing ▁side , ▁in ▁this ▁case , ▁Hill ary ▁Cl inton , ▁could ▁cast ▁their ▁votes ). ▁In ▁ 2 0 1 6 , ▁there ▁were ▁attempts ▁to ▁do ▁away ▁with ▁the ▁roll ▁call , ▁but ▁the ▁Sand ers ▁campaign ▁refused ▁this ▁idea . ▁ ▁Ne ither ▁the ▁Democratic ▁nor ▁Republican ▁national ▁convent ions ▁have ▁had ▁a ▁multi - ball ot ▁vote ▁for ▁president ▁since ▁ 1 9 5 2 ▁ ▁or ▁vice ▁president ▁since ▁ 1 9 5 6 . ▁ ▁Notes ▁ ▁See ▁also ▁▁▁ 2 0 2 0 ▁Democratic ▁Party ▁president ial ▁prim aries ▁▁ 2 0 2 0 ▁Republican ▁National ▁Convention ▁▁ 2 0 2 0 ▁Libert arian ▁National ▁Convention ▁▁ 2 0 2 0 ▁Green ▁National ▁Convention ▁▁ 2 0 2 0 ▁Constitution ▁Party ▁National ▁Convention ▁▁ 2 0 2 0 ▁United ▁States ▁president ial ▁election ▁Imp act ▁of ▁the ▁ 2 0 1 9 – 2 0 ▁coron av irus ▁pan demic ▁on ▁politics ▁ ▁References ▁ ▁Category : 2 0 2 0 ▁con ferences ▁* ▁Category : 2 0 2 0 ▁in ▁Wisconsin ▁Category : 2 0 2 0 ▁United ▁States ▁president ial ▁election ▁Category : 2 0 2 0 s ▁in ▁Mil w au kee ▁ 2 0 2 0 ▁ 2 0 2 0 ▁National ▁Conference ▁Category : J uly ▁ 2 0 2 0 ▁events ▁in ▁the ▁United ▁States ▁Category : August ▁ 2