Looks like original graph came from this data

Taken from /u/supertrouper77

• Source: https://twitter.com/nsram/status/1325315267690438658?s=20
• Github: https://github.com/nsram/bellwethers-2020

Kent, Delaware Biden 51.2% / Trump 47.1%

Delaware, Indiana Trump 55.7% / Biden 42.4%

Porter, Indiana Trump 52.2% / Biden 45.9%

Vigo, Indiana Trump 56.4% / Biden 44.4%

Eaton, Michigan Trump 49.5% / Biden 48.7%

Shiawassee, Michigan Trump 59.0% / Biden 39.2%

Van Buren, Michigan Trump 55.3% / Biden 43.0%

Clay, Minnesota Trump 50.9% / Biden 46.8%

Hillsborough, NH Biden 52.8% / Trump 42.5%

Valencia, New Mexico Trump 54.0% / Biden 44.0%

Orange, New York Trump 54.2% / Biden 44.4%

Oswego, New York Trump 64.9% / Biden 32.9%

Otsego, New York Trump 56.8% / Biden 40.9%

Madison, New York Trump 59.9% / Biden 37.7%

Saratoga, New York Trump 49.0% / Biden 48.0%

Washington, New York Trump 61.7% / Biden 36.2%

Warren, New York Trump 55.0% / Biden 42.8%

Ottawa, Ohio Trump 60.8% / Biden 37.7%

Sandusky, Ohio Trump 62.8% / Biden 35.3%

Wood, Ohio Trump 52.9% / Biden 45.3%

Chesapeake, Virginia Biden 52.2% / Trump 46.1%

Clallam, Washington Biden 51.8% / Trump 46.2%

Racine, Wisconsin Trump 51.3% / Biden 47.2%

Winnebago, Wisconsin Trump 51.0% / Biden 47.0%