The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Polymarket's[2] rules open with "A presidential election is scheduled to take place in Brazil on October 4, 2026", which is the first Sunday of October, the date Brazilian law sets.
The second-place market repeats the October 4, 2026 election date and prices the same two front-runners, which is how the pin reads the race as a Bolsonaro-Lula runoff in waiting.[1]
Monocle's The Briefing, two weeks out, has "Brazilians prepare to head to the polls as the presidential race narrows" and names the same two front-runners the market prices, Lula and Flavio Bolsonaro.[1]
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Junta Electoral Central