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The Evergreen Freedom Foundation

Congressional Effect Management (CEM) - http://www.congressionaleffectmanagement.com/

Congressional Effect Management has analyzed empirical data from January 1, 1965 through December 31, 2007 to determine the performance of the S&P 500 Index on days that Congress was “in session” (a day when either house of Congress meets for business) and “out of session” (a day when neither house meets).