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This it goal will not be reached quickly. perhaps not in my lifetime. it will take patience and persistence. but now we, too, must ignore the voices who tell us that the world cannot change. we have to insist, yes we can. >> that was in 2009 just weeks after he was inaugurated. the following year in 2010, president obama convened the first nuclear security summit in washington. more than 40 heads of state got together to discuss among other things how to best safeguard the nuclear material that already exists around the world. that same year president obama signed a new stark treatment. an agr...

Events. i don't know that we're any different than any other state, just a little more celebrated. >> you're right that they do tend to pick the winner. and it is different this year, though, because of the super pacs and spending all this money. you wonder what would newt gingrich be doing if someone hadn't written a $5 million check you know, from the casino. do you think the super pacs are going to have the net effect of allowing some candidates to stay in the race and maybe making it a longer slog for whoever the eventual nominee is? >> yeah, i don't. i think, look, super pacs can be helpf...

Their cost. still there is a growing consensus in france which includes even those promoting nuclear reaction construct that perhaps the country has become too dependent on nuclear power, and while france cannot change its mix of energy overnight, looking ahead, many would like to see renewable forms of energy and nuclear a lesser one in the years ahead. jim pitterman, cnn, parns. >> still ahead here on "world business today," the mighty mississippi just got mightier, we'll tell you about the impact it's having on people and businesses in tennessee. we'll also hear live from the web center to ...

Vision of the world minus nuclear weapons. >> i state clearly and with conviction america's commitment to seek the peace and security of a world without nuclear weapons. this goal will not be reached quickly. perhaps not in my lifetime. it will take patience and persistence. but now we, too, must ignore the voices who tell us that the world cannot change. we have to insist, yes, we can. >> yes, we can change he says, and we sort of have. incremental but important ways on this issue. the call for a world free of nuclear weapons isn't a new one. it was a vision of course shared by president john...

To the use of nuclear weapons. so we are at charles university. one of the oldest universities in the world. to get an idea, what do the people think about all this? at the law school, the students have vivid memories of the president's speech in prague one year ago this week. >> somehow, we, too, must ignore the voices who tell us that the world cannot change. we have to insist, yes, we can. >> reporter: where he first revealed his version of the nuclear free world to some 20,000 people. >> i don't know, maybe the last one. >> reporter: what did you think of the speech then? >> it was good. i...