Back in the run up to the '92 election (when I was still a registered Dem) I couldn't bring myself to vote for Clintoon, for a lot of obvious and non-obvious reasons. So, the last vote I made in a Dem primary was a protest vote for Jesse Jackson, against Clintoon. (There was no chance in hell that he could win in my state, so I felt safe in doing so.) That was my last vote cast as a Dem. I registered as a Repub as soon as I could.
I’ve always been registered as Republican- a decision I made as soon as I was old enough to vote :) I hate Bill Clinton, even to this day. I was teaching civics late in his tenure and he made it impossible to teach high school students about the Presidency without the matter of oral sex being brought up.