The example of being forced to choose the lesser of two evils does not apply to elections because no one is "forced" to choose in an election.
Being forced to give up your limb or life for another i.e. St. Kolbe is a virtue set out by Christ, "Greater love hath no man than this, that a man lay down his life for his friends."
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Furthermore, free elections always have the option of not voting at all. Given that freedom, why would one ever vote for, or support, evil? And how could that ever be God's will for an individual?
This lesser of two evils phenomena is a political tool of liberals, libertarians and conservatives in name only who are hell bent on getting their political way.