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Effect to clamp down on iran and oil sales key to its economy. this is all part of an effort to put so much pressure on iran, the regime will simply stop its pursuit of nuclear power. now, before these tough sanctions go into effect u the obama administration has granted waivers to 8 countries allowing them to keep buying iranian crude if exchange if they just buy less of it. but why? do we really need all those waivers? mark leibowitz, do we need those waivers? >> hi, jenna. you know, we needed...