Really?
No they don’t count the votes from early votes or release totals before election night.
This sort of poll is talking about how many registered voters of each party have returned ballots so far, not specifically who they voted for.
It is odd isn’t it?
Early voting should be aligned with the general polling, 15 points is a large discrepancy - unless all the other polls are wrong. If non early voting isn’t statistically inline with early voting, something is fraudulent.
Do they actually count the votes and release the votes in Iowa (or anywhere else for that matter) before the election?
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No, they just compare received ballots with names of people who have registered Republican or Democrat. No one knows who these people voted for. Early/Absentee votes are not to be counted before Election Day. Everyone needs to chill.