@Cadberry what were the respective start and end probabilities?

@Siebe 50% to 45%.

I moved some options a fair bit, from 4% to 12% in one case. If someone disagrees lmk and I'd be down to bet more on some of these before the debate starts

...why is this market not centered at zero?

(At the time I wrote this, 75% of the probability mass was on Trump losing ground in the markets after the debate.)

cause he's gonna lose the debate lol

So? People are expecting him to lose the debate. So e.g. if he loses the debate but only by a little, we should expect the market to move in Trump's favor.