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, 2006 and 2007 voting-age population estimates (2010 intercensial adjustment) interpolated to Nov. 2006, non-citizen estimates from the 2006 and 2007 American Community Surveys interpolated to Nov. 2006, the year end-year 2006 DOJ prison report and the end-year 2006 DOJ probation and parole report. The overseas eligible estimate is provided by the Federal Voting Assistance Program.