Last night it was all about paul ryan. He rocked this house, setting the stage for mitt romney and a surprise guest tonight. It's "your voice, your vote." David muir is down on the convention floor... See More
Last night it was all about paul ryan. He rocked this house, setting the stage for mitt romney and a surprise guest tonight. It's "your voice, your vote." David muir is down on the convention floor with last night's highlights. Hey, david. Reporter: Hey, george. We were together last night. And this convention hall was electrified when paul ryan came on the stage last night. Introducing him to a national audience. And introducing tough talk, welcoming that role of a vice presidential candidate. On the attack. After four years of the runaround, it's time for a turnaround. Paul ryan, the first v.P. Candidate in the post baby-boom generation, just 42 years old, spoke of the next generation. I expect the calling of our generation, to give the america our parents gave to us. Reporter: Next, a message to the president. We have suffered no shortage of words in the white house. What is missing is leadership in the white house. Reporter: Arguing, it's the other side going negative, to hold on to power. With all their attack ads, the president is just throwing away money. And he's pretty experienced at that. Reporter: Ryan promised, in his words, to repeal obama care. And says if the president wants to debate over medicare, bring it on. Ryan became physically emotional, when he spoke of his mom, betty, sitting in the audience with ryan's wife, and three children. At one point, his son struggling to stay awake. And he spoke of the father he lost at 16 to a heart attack. He talked about the young people with the posters, celebrating hope and change four years ago. College graduates should not HAVE TO LIVE OUT THEIR 20s IN Their childhood bedrooms. Staring up at faded obama posters. Wondering when they can get up and get going with life. Reporter: And to a return to the political stage, former secretary of state condoleezza rice, welcomed back by a roaring crowd. We do not have a choice. We cannot be reluctant to lead. And you cannot lead from behind. Reporter: She spoke of her own childhood, of her parents, who taught her to dream. They have her absolutely convinced that even if she can't have a hamburger at the woolworth's lunch counter, she could be president of the united states, as she wants to be. And she becomes secretary of state. Reporter: Condoleezza rice back on the political stage. But it was paul ryan teeing up mitt romney. There were a lot of attacks, a lot of promises in that speech he gave. The obama team taking aim with the battle lines drawn. You see over my shoulder, they're getting the stage ready for mitt romney tonight, who will make his case to the nation.
This transcript has been automatically generated and may not be 100% accurate.