TL;DR

Michigan lets you vote individual candidates, or a "straight party" option. Each blue dot is a precinct. The more "straight party" Republican votes in a precinct, the more % of Trump votes were siphoned to Biden.

100% this is a computer algorithm, because the data shows that the % of votes siphoned to Biden increases perfectly linearly, the more straight party Republican votes, across all the precincts.

For example, a precinct that had 85% straight republican votes, had 20% of Trump votes siphoned to Biden - leaving Trump with 65% in that precinct.

Wayne County (Detroit) did NOT show evidence of an algorithm. Only Republican precincts had votes siphoned. It looks like the algorithm didn't kick in unless the precinct had 20% or more straight republican ballots.

TL;DR

Michigan lets you vote individual candidates, or a "straight party" option. Each blue dot is a precinct. The more "straight party" Republican votes in a precinct, the more % of Trump votes were siphoned to Biden.

100% this is a computer algorithm, because the data shows that the % of votes siphoned to Biden increases perfectly linearly, the more straight party Republican votes, across all the precincts.

For example, a precinct that had 85% straight republican votes, had 20% of Trump votes siphoned to Biden - leaving Trump with 65% in that precinct.

Wayne County (Detroit) did NOT show evidence of an algorithm. Only Republican precincts had votes siphoned.