E.g. if a census tract is 90% Green and the votes are 90% for Mango, then its a reasonable extrapolation that Greens voted for Mango.

Voting information is public information. One can't tell who one voted for, but one can see that 98.382% of a district/census tract/zip code voted. Coupled with other data, one can make pretty good inferences.

Now, statements like "Moral issues were #1 with Green voters" is a bunch of nonsense, especially in Plague Times.

Cheers,
Scott.