Ben Affleck scored some bipartisan praise on capitol hill this week when he joined the U.S. On Congo. Leveraging star power for the aid to the country. He's traveled there nine time for the eastern... See More
Ben Affleck scored some bipartisan praise on capitol hill this week when he joined the U.S. On Congo. Leveraging star power for the aid to the country. He's traveled there nine time for the eastern Congo initiative. And as he told Martha Raddatz, that mission has changed his life. Reporter: Of the celebrity stars using celebrity to focus cameras on a favorite cause, Ben Affleck who's dedicated himself to the eastern Congo is one of the most well-respected. You are qualified to give us the benefit of your experience and knowledge. We admire your acting, but we admire your activism even more. I am, to state the obvious, not a Congo expert. I'm an American working to do my part for a country I believe in and care deeply about. Reporter: The Numbers are mind-boggling. 5 million dead since 1998. Almost 3 million still displaced from their homes last year. Targeted investment and promising congolese-liven driven solutions can and will drive economic growth and create jobs. Reporter: But Affleck doesn't just talk about it, he has been there nine times with his organization, eastern Congo initiative. It's not that people don't care about Africa or about terrible crisis like this, it's just like you don't to want hear about it. It's so vile. It's so difficult. And you can't take it in. How many millions of people. I can't understand that. It really struck me. Why is this child's life worth less than my children? Why is this woman worth less than my wife? Reporter: What would you say to Americans about why they should care about this? This is who we are as Americans. We believe in helping others who are down, being exploited. Those are our values. We are weary because we have been involved in conflicts overseas, sapped some of our will. We have been disillusioned with overseas. But I don't believe we should give up on the core values. It's a model for the way the United States needs to approach this. He's given it sustained attention. That's my motto for what the United States is trying to do here. Reporter: Something on your website, your life didn't have much meaning until you did this. Before you engage, people sit down and say this is what you're doing? Being a celebrity? Not giving back? I haven't done anything substantial, aside from my work, that I can look back on and say I contributed to society in a way that was commensurate with the blessings that I have. Reporter: There is rare good news out of the Congo after a decade of fighting, a major rebel group surrendered last November. And a special all-africa-led U.N. Peace keeping team has had success reducing the violence. Still, Affleck and Feingold say that the U.S. Should press the young government to do more, like hold fair elections and fix the police. Without those things, yes, it becomes very fragile, and we can lose the progress. It's not going to cost a lot of money. Getting the attention of the secretary and the president and the senate and the house to say this is a priority for us. That in and of itself can kind of move mountains. Reporter: Affleck will continue his work, but with a pause for tonight's Oscar ceremony. Let me ask you one question you were not asked on capitol hill? What are you doing for the oscars? My wife's presenting, I am not. But I'll probably sneak along with her. We'll have a date night. We will go to parties and have a good time. Reporter: His wife in the oscar-nominated movie "Dallas buyers club." My heart is with the movie, she's so great in it. Your prediction, senator? I'll be watching on television. You should come with me. Now you're talking.
This transcript has been automatically generated and may not be 100% accurate.