If you're down in the dumps and in need of something to lift your spirits, tune in to the work being highlighted this week at the Opportunity Nation Summit. The word "opportunity" has been used and abused for…

Sep 19

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President Obama talks with David Letterman during a taped appearance that aired Tuesday night. Photo by John Paul Filo/CBS via Getty Images. Whether you take the national view or go state-by-state, the polls all seem to show the same thing:…