it really sounds like that voter (or that group of voters) effectively have no choice.

Welcome to being part of a small minority in a democracy; sorry that democracy isn’t utopian and that changing minds requires time and effort. “I want a leader who agrees with all of my positions but I don’t want my positions to have to be popular or supported by a broad swathe of the population to achieve that” is more vanguard politics stuff; democracy isn’t really your speed.