So, here are some numbers:
PA (99% reporting):
Senate Rep voters: 816,292Okay - looks like PA shows more enthusiasm among Dems... at least based on absolute turn-out.
Senate Dem voters: 1,043,037
Governor Rep voters: 848,589
Governor Dem voters: 1,016,405
(It'd be nice to know absolute numbers as % of registered voters, but quick search has not turned up voter registration data.)
KY (119 of 120 precincts reporting):
Senate Rep voters: 351,927Again - in only state-wide election, Dems outperform GOP in absolute turn-out.
Senate Dem voters: 520,412
(... and again, it'd be nice to know % relative to registered voters.)
Sen Rep voters (82% precincts reporting): 123,431 (=133,968 prorated to 89% reporting)Again, Dem absolute turn-out eclipses GOP - by a decent margin.
Sen Dem voters (89% precincts reporting): 310,741
So - IF primary voter turnout is predictive of turnout in general elections, these three nationally-prominent contests bode well for Dems come November.