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Heilemann: Romney's tax rate less important than offshore accounts

Top Talkers: The Morning Joe panel – including New York Magazine's John Heilemann, CNBC's Brian Sullivan and the Council on Foreign Relations' Richard Haass – discusses reports that political campaign ad spending has topped $500M this year, Romney's taxes, and a new CNN/ORC poll that shows Romney may be benefiting in Wisconsin by choosing Paul Ryan as his VP running mate.