The preferred turnout rates are those calculated with the voting-eligible population as the denominator. The voting-eligible population (VEP) represents an estimate of persons eligible to vote regardless of voter registration status in an election and is constructed by modifying the voting-age population (VAP), by components reported in the right-most columns (scroll right in the spreadsheet).
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Turnout data are culled from state election websites. The demoninator data reflect the July 1, 2004 and 2005 voting-age population estimates (2010 intercensal adjustments) interpolated to Nov. 2004, non-citizen estimates are interpolated from 2000 Census and the 2006 American Community Survey interpolated to Nov. 2004, the year end-year 2004 DOJ prison report and the end-year 2004 DOJ probation and parole report. The overseas eligible estimate is recently updated with data provided by the Federal Voting Assistance Program.