Panning for voters who will show up is tricky for Kentucky Dems
The issue for Dem candidates courting college students for the 2019 May primary vote is the college calendar isn't conducive to students going to the polls. The University of Kentucky is holding graduation on May 6th, the earliest of the state universities. The other schools we checked - Morehead State University, University of Louisville and Murray State - all have graduation on May 11th. That's a full ten days before the primary.
Traditionally, undergrads are long gone before graduation day. They will be back home before the primary. The push to register college students in their college town is a plan for the general election, but leaves students trying to figure out absentee balloting (if they are not "townies") to vote in the primary. The 4% turn out in the primary is a reflection of how many make an effort.