The #1 thing that moved election betting odds was the 1st debate (Sept 29). Gamblers took that as new & surprising information. So I guess gamblers are ill-informed. The 36/64 split is pretty close to 50/50 what you'd bet on 0 info.
https://www.electionbettingodds.com/President2020.html#chart
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November 3, 2020