Did a quick analysis - looks like primary turnout has been decreasing over last 20 yrs. The data is gathered from official election results, hosted by the Office of Elections. I’ve pulled the total number of registered voters and the primary turnout from 1992 to 2012, and aggregated the data in a Google Doc.
The graph above compares registered voters to turnout.
Looks like the 20-year trend is a decrease in primary election voter turnout.
What do you think?