One vote for is for Delegates-at-Large and Alternates-at-Large to the National Convention. The second vote is for District Delegate and District Alternate to the National Convention for the ___ Congressional District.
This is the way it has been done for years, this is nothing new.
Technically, we Ohioans are not voting for the candidate. We are voting for the delegates that will go to the convention on our behalf and cast their ballot for the candidate they represent.