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Republican presidential nominee Mitt Romney shakes hands with President Barack Obama at the start of the first 2012 U.S. presidential debate in Denver on Wednesday.JASON REED/Reuters

The first of three U.S. presidential debates kicked off Wednesday at 9 p.m. (ET). The Globe's Adam Radwanski and Doug Saunders as well as four expat Canadians now living in the United States are providing their analysis of the event. Weigh in with your thoughts and questions below.

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