Donna Brazile looks back at 50 years after 1964 . The deaths of three young crusaders help spur CNN to pass Freedom Summer of 50 years . ( CNN ) -- CNN on Thursday continues its series `` The Sixties , '' which explores the decade of historically significant social movements , people and events . Brazile calls on Philadelphia to create a summer of economic freedom and secured voting rights .
Donna Brazile looks back at 50 years after 1964 . The deaths of three young crusaders help spur CNN to pass Freedom Summer of 50 years . Brazile calls on Philadelphia to create a summer of economic freedom and secured voting rights .