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Of north america. >> thank you very much, everyone. >> we were just watching the news conference being held by president obama as well as mexicos president calderon and stephen harper. also those leaders taking questions. the "news nation," well have more on that. were also following news at the end of this hour. new video ott of the fbi on the scene where trayvon martin was killed last month. the agents of the fbi have been there since this morning. a bureau official says they are conducting wh...