Lugar is from Indiana, not Ohio. We do have Party Line ballots.
I hope Lugar loses. I think he’s a lib.
It will be VERY hard to overcome the advantage an incumbent has when there is a Party Line Ballot in a primary unless the incumbent screws up seriously or the challenger is far ahead. The Party Bosses in each County are generally beholden to the incumbent and he/sje gets the Party Line. A lot of registered voters just go in and cast a primary ballot for the Pary Line Candidate.