Not everyone; he goes on to say "If you're a politician who has ever voted against doctor-assisted suicide, or you would vote against it in the future ..." and

Not everyone; he goes on to say "If you're a politician who has ever voted against doctor-assisted suicide, or you would vote against it in the future ..." and another clarification about citizens who have based a vote on opposing doctor-assisted suicide. I assume the original "might" is because you may or may not fall into one of these categories.