> If by 2-turn you mean majority-runoff, that still has perverse incentives against voting for other than the more preferred major party candidate, though sligh

> If by 2-turn you mean majority-runoff, that still has perverse incentives against voting for other than the more preferred major party candidate, though slightly less so than does plurality. Highly less, I would say. When the two most voted candidates go to the second round, you may vote for a third candidate knowing that, in case this preferred one fails, there is still the chance to vote against the one you hate more in the second round. In a single-run voting, people are more compelled to vote against the candidate the hate more, instead of voting for the one they like more.