walker bush, do solemnly swear... >> narrator: seven presidential elections.... >> a generation assumes new responsibilities... >> narrator: frontline has investigated the candidates... >> america's best days are yet to come... >> narrator: who would be president? >> i, william jefferson clinton, do solemnly swear... >> i believe we have to make the right choices... >> we will meet aggression with resol and strength. >> do everything in our power to change the world. >> i, george walker bush, do solemnly swear... >> narrator: the moments that shaped them... >> i won't let you down. i won't... >> let it be said we refused to let this journey end. >> that future is our destiny... >> narrator: the presidents they would become... >> i, barack hussein obama, do solemnly swear... >> we have to heal the divides in our country. >> i am your voice. >> narrator: and now on frontline... >> that the end of this chapter of american darkness began here. >> narrator: "the choice 2020". >> frontline is made possible by contbutions to your pbs station from viewers like you. thank you. and by the corporation for public broadcasting. major support is provided by the john d. and catherine t. macarthur foundation, committed to building a more just, verdant and peaceful world. more information at