Democrat turnout in the primary in 2016 was about the same as in 2008: 1.97 million v 2 million.
Republican turnout was considerably higher in 2016 over prior years. In both 2008 and 2012 Republicans turned out 0.9 million voters, but this year it's up to 1.38 million, 53% higher.
The reason?
Well it ain't Ted Cruz.