In 2008, the last time the Democrats did not have an incumbent on the ticket, they had approximately 38 million Primary voters. In 2016, that number slipped to approximately 30 million. A loss of 8 million primary voters.
In 2008, Republicans had 21 million primary voters. In 2012, the number slipped to 19 million. In 2016 however, the GOP had over 30 million primary voters – approximately 9-10 million more than 2008.
That is a change of approximately 17-18 million voters in favor of the GOP.
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