I have been voting for nearly 50 years. When it comes to president, a conservative usually has to vote for the lesser of two evils, to me that is not much of a choice. The only two votes I ever cast with fervor, were for Ronald Reagan. I expect never to vote again in that manner. I see no one on the horizon with his stature.
The realization I have finally come up with regarding your point of a "lessor of two evils" to vote for...
...is that if MY candidate fails to win in the REPUBLICAN PRIMARY, it is because I FAILED to do MY job to WORK 200% to get MY CANDIDATE NOMINATED via the PRIMARY.
If I FAILED, and another candidate wins the PRIMARY, then it is MY responsibility to WORK FOR and SUPPORT MY PARTY's nominee.
Start looking at it being YOUR FAILURE to either get YOUR CHOICE NOMINATED via the PRIMARY, or YOUR FAILURE to RUN for the position if you think there aren't any satisfactory candidates to choose from in the PRIMARY, and then WORK FOR and SUPPORT THE WINNER of the PRIMARY!
If we ALL start taking THAT attitude, we might just find ourselves WORKING OUR REAR ENDS OFF to get OUR guy nominated via the PRIMARY.