Oz was losing the entire primary until Trump endorsed him... Trump owns some very larger responsibility for the OZ fiasco.. and even with OZ’s endorsement he just barely won the primary...
OZ fiasco isn’t fully Trump’s fault, no but he has culpability, as to Hannity and the establishment GOP for their ruthless attempt to destroy Barnette when she became a real threat.
No Trump isn’t solely responsible for the Oz fiasco, but he absolutely has culpability in it.
Pennsylvania has been dragged down by some terrible GOP candidates in several consecutive election cycles.