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. >> richardening until vienna, thank you for joining us this morning. >>> the dramatic developments out of iran coincide with the big political weekend here in the u.s. ending this weekend and this evening what nbc news/youtube democratic debate in south carolina. nbc's kristen welker joins me from the scene of the debate in charleston. kristen, you've been following the candidates all weekend. how are they gearing up for tonight? considering it's the last debate before the iowa caucuses and the new hampshire primary. >> well, there is a lot of preparation going on behind the scenes. it's just 15 days before the all-important iowa caucuses and the democratic and republican races too close to call in the hawkeye state so tonight's debate will be pivotal. with just hours before the democrats duke it out tonight in charleston, the candidates courted voters at the a dinner here saturday night. >> we must stand up for working people and low income people in every state in this country. >> reporter: and they took aim at republicans, secretary clinton excoriating some of the language used