New constitutional amendment. We take nominations and hold a national single-round vote. If one person gets a majority, they get chained to a boulder and thrown into the ocean.
And yes, I realize that by proposing this, I'll probably be the first one voted into the Sea. That's fine. I'm willing to take one for the team.
You could turbo charge it by adding that once a vote is taken where no candidate gets a majority no further votes may be held. That would encourage people to keep showing up to vote and to vote for candidates they might not believe deserve death by drowning just to keep the system functioning.