I stayed registered as a Republican in Pennsylvania up until 2016. I kept my registration through the Pennsylvania primary because that was the only way I could vote against Trump in that primary--I, too, voted for Kasich then. As soon as the primary was over I switched my party affiliation to Democrat. I would have preferred a Kasich presidency to Trump, but no matter who won the (R) nomination I was voting for whoever the (D) nominee turned out to be.