How do they know the party affiliation of voters?
Isn't it supposed to be secret ballot?
Are ballots tagged in some way?
Here in Long Island, NY, you vote via a huge sheet with several rows -— Democrat, Republican, Conservative, Green, Workers Party
Each row has its own candidate and all you do is BLACKEN the oval of the person you want to vote for.
The paper is then read via an electronic reader, and automatically tallied.
They should be able to know how many votes Trump/Pence had vs. Biden/Harris immediately.