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If they were independent, then it would be trivial to update on each of them and arrive at a meta-forecast much greater than 80%. But they're really not. Many of them are based on the same polls, news, and historical behaviors. They may have different models, but they're very much not independent forecasts.
I agree. That's why calculating the "combined" forecast is hard -- you need to estimate the degree of co-dependency. But as long as the forecasts are not exactly the same, each new one gets you a (metaphorical) bit of information and your posterior probability should creep up from 80%.