I think that it is always the case that there are a lot of voters who would have preferred to vote for a different candidate at the end of an election. We have a two-party system because of the way plurality voting works (see
Duverger's Law). So you can vote for one of the two party candidates or just leave it up to others to decide which of them will win. There are a lot of people who use third-party candidates as a kind of protest against the major party candidate they prefer, but that just tends to get them the greater of two evils, since their vote would have gone to the lesser if they had chosen a major party candidate. Personally, I prefer not to think of my choice as the "lesser of two evils". For me, it is just the "better of two candidates". I never get everything I want in the politicians I vote for.