Democrat primary turnout in 2008 in Ohio was 2.2 million (in 2012 0.5 million for the incumbent Obama), but in the 2016 contest last night it struggled to round off at 1.2 million.
On the Republican side, turnout yesterday in Ohio was 2 million in contrast to 2008 and 2012 when turnout was 1.1 million and 1.2 million respectively.
Since Republicans and independents only could vote in the Republican primary in Ohio, not Democrats, it looks like independent support for the Ohio governor carried the day for John Kasich yesterday.