There's an interesting geeky story here about how partisan polling firms have learned to juke the stats to manipulate these polling aggregates (and betting/prediction markets).

Its not totally new, and I'm genuinely confused about whether it actually helps in a normal election where turnout is key so seeming just behind is possibly optimal. But in a world where false accusations of voting irregularities have already resulted in riots and deaths it's probably something we'll be talking about in the future.