Early Sunday afternoon at LGM.
If today’s election in Serbia offers potential grounds for optimism, Brazil should take care of that. The main thing to add to the first round post is that the first round result was better than expected for Bolsonaro, and we should probably adjust our priors from “tossup, maybe ever so slight lean to Lula” to “Bolsonaro is the clear favorite.” His 2 point victory was a surprise, as Lula was expected to win the first round, with Bolsonaro expected to pick up a majority of minor candidate supporters. Post election polling has been tight but pretty consistent; the last 5 published polls all had Bolsonaro up by 1%; polling aggregators show the composite result as about a 1.5% Bolsonaro lead. So Lula supporters have to root for a fairly modest polling error, but it would need to be a polling error in the opposite direction of round one’s polling error. Possible! Not particularly likely. Gambling community sees Bolsonaro as a ~4-1 favorite which seems about right to me. Grim.
Later that same day...
lol reminder that betting markets are extremely accurate measures of conventional wisdom
— Josh Marshall (@joshtpm.bsky.social) October 25, 2026 at 5:47 PM
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Marshall continued in following Bluesky thread [reformatted].
To expand on my point about these “markets” I’m not getting into the issues w corruption or damaging impacts of gambling. Their supporters in the political space habitually argue they are superior to polls in their predictive ability. In the simplest sense they’re just not. But to the extent they predictive they are operating off perceptions which come from polls. So they fail this test both empirically and logically. There are exceptions to this. Lightly polled races. Figuring in other factors besides polls. But big picture there are zero prediction market books on elections that don’t rely primarily on polls.
I'm on the record as being generally hostile to the whole notion of general election forecasting for a mass audience. With a few isolated exceptions, I little social good in knowing in advance how an election is going to turn out even when the process works, certainly not enough to justify the emphasis. Most election stories are empty calories, devoid of the information that would be of value of voters largely because they are filled with the cheap and tasty high fructose corn syrup of polls and models and prediction markets.
As Jay Rosen and Margaret Sullivan keeps reminding journalists, "not the odds, but the stakes." Obviously, this being an election in another country changes things -- we aren't the voters who need to be informed -- but the fundamental issue remains the same: why were predictions of who was going to win an election in a few hours newsworthy? Wasn't there something more important to talk about?
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