. >> reporter: and obama hself turned out to be a highly polarizing president. polls show he's never become either hugely popular like ronald reagan or bl clinton, or hugely unpopular like jimmy carter or george w. sh. his favorability hovers under 50%. his presidency a time of turmoil and division and bitter angry politics. the opposite of what he promised and hoped when he burst on to the scene with a speech that ignited the 2004 democratic convention. >> we are one people, all of us plenling allegiance to the stars and stripes. states of america. >> reporter: after tonight, no more of these presidential moments are left to him. america has come to know this couple, this historic first family, and watched as their girls grew up and watched as their dad grew gray. >> thank you. god bless you. god bless the united states of america. >> reporter: for "nightline," i'm terry moran.. >> on this night of politics we're reminded of the words of one of our former presidents, there's nothing wrong with america that cannot be cured by what is right with america. thank yo

millionsf americs livg in pover clinton touted her experience and jument, oering hself as a praatic oion to build on t obamaegacy. >>> and the republicans race, donald trump tooko twitt today to call senator ted cz a nervous wreck who is dropping like a rock. czold an audience in manester, iowa tte will not engage in assaults and personal atcks. but cruz tevision ad lhing out at trump over hisusiness practices. >> and a new ement in the presidei campgn, word that mayor michael bloomberg may enter the race as an rick williams in des moines for the iowa caucusesnd watching thursday night on "action news" at 11:0 >>> a grand jury in texas has cleared planned parenthood of wrong doi over t corovsl videos, appearing to suggest that planned parehood was iegally selli fetal tissues and organs of orted baes. instead they indicted the two tivisted behindhe videos. >>> and the srch forhree inmates escaping from an orange county jailn friday. thecut through a plate, crled through unsecured pluming and rappelled using gone hours before anybody noticed they were missing. detectives looking whether they had help from som