Economics expert and professor Paul Solman explains the underlying causes which led to this week's economic downturn. Judy Woodruff looks at excerpts of the Thursday Florida GOP debate. Analysts Mark Shields and David Brooks discuss the events of the week, notably the economic downturn and increasingly heated political campaigns. The Writer's Guild of America has been on strike over a dispute on 'residuals' -- money made mostly by DVD sales, and internet content.moreless
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