the president do, stand before the united nations, tell the world come directly to indicate to the ayatollah, we will not let them acquire a nuclear weapon, unless he is talking about going to war. host: matthew lee? guest: vice president joe biden brings up the question, what exactly does mitt romney want to do differently? the obama administration, like the bush administration, has pursue tough sanctions against iran at the un and it has succeeded. this the administration has also imposed harsh unilateral sanctions. these were passed by congress, but the administration went along with them and has implemented them. we see significant deterioration in the iranian economy, largely, or a least in part because of these sanctions. again, as the vice president said, and messiest talking about going to work, it is not clear what mitt romney would do differently. it is one thing to say i will rally the international community, get the russians and chinese on board, but it is another thing to be able to do that in real life. host: richmond, virginia. matt, an independent scholar. caller: i am more worr