2012 = 14 million
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Curious as to where you are finding that turnout number of 14 million? The turnout for the 2012 Nov. General was only 7,964,668.
Total registered voters were 13,646,226 ....
source: https://team1.sos.state.tx.us/enr/results/nov06_164_state.htm
The following gives the historical numbers:
http://www.sos.state.tx.us/elections/historical/70-92.shtml
I misread the SOS.