I think you’re right! The only way to keep the donkeys fighting all the way to Denver is for all good Republicans to cross over and vote for Obama!
(Can I call them “donkeys” with a black man in the race??)
It’s over a month until the PA primary. However,you must be registered as a Dem by March 24 to vote in the primary election.
A lot can happen between now and then. Best to wait and vote for which ever is behind, sending them to a brokered convention.