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I’m not sure what could possibly be suicide for his presidency.
Him saying he secretly likes Democrat policies and thinks they are better at governing (but he has to run because he’s the property of Russia).
Although only the first part would be a deal breaker for the highly intelligent Republican voter.
The ordering of how right wing they are matters. That’s the whole point of preferential voting.
If you abstain from ranking all candidates, you are acting the same as US voters claiming that “both sides are the same” and then not voting, particularly if your preferred minor candidate(s) doesn’t have a chance of winning in your electorate.