Vote trading, I believe, only makes the value of a vote higher for individuals. It allows voters more control over a second-choice candidate, so that, even if the lesser of the evils is elected, it is still not the worst. While it could be considered unethical to swap votes for candidates for the purpose of manipulating the outcome of an election, I don't see that it should be considered illegal in any sense of the word as long as there is no capital or tangible value gained through the transaction.
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