host: mike seidman? guest: that is a good question. it was famously said that the constitution was written for many different kinds of people with many different kinds of views, and the constitution is broad enough to encompass a range of different views about economics and the role of markets. the framers had particular views on those things, but they are 200 years old, and economics has advanced. people have different views now. we live in a democracy and within a very broad constraints, people are allowed to use what sort of economic system they want to have. hitchcock roger pilon. i have a -- host: roger pilon, i have a tweet -- guest: the is a complex question. people should be free to enter into whatever relationships they wished in a free society. that is the best way to begin to answer that question. if they want to pay for things in gold, they should have the right to do so, and the recipient should have the right to deny receiving it. unfortunately, those relationships are constrained by regula

. >> brown: on that agreement, randy barnett, miked seidman, thank you very much. >> anks for hing me. >> ifill: again, the major developments of the day: mitt romney took aim at president obama, after sweeping three republican primaries on and wall street had one of its worst days in a year. the dow industrials lost nearly 125 points. online, we look at al qaeda web sites that have been offline for more than a week. hari sreenivasan explains. hari? >> sreenivasan: we explore what it means for the international jihadi movement if the chat rooms and forums stay dark. that's on our world page. you readnd wte a second langge? ifo, y canelp t the "newshour" translation team as we caption and subtitle videos this political campaign season. and on art beat, we have a different take on the impact of new technology. watch a video on the art of video games, part of an exhibit at the smithsonian american art museum. all that and more is on our website: newshour.pbs.org. judy? >> woodruff: and that's the "newshour" for tonight. on thursday, the "daily download" examines how the presidential camp