“Joe Biden’s margin of the less than 21,000 votes in Wisconsin was the tightest of any state in 2020.”
Wisconsin: Trump won here in 2016 by fewer than 23,000 votes. Biden, though, won it by 20,500 votes (pending a recount). So every vote counted. Biden turned out more Milwaukee County voters and won by a 20,000 more votes than Clinton did in 2016. But Biden's biggest vote gain came from Dane County, home to Madison and the University of Wisconsin. He won there by 35,000 more votes than Clinton did in 2016. Biden also chipped away in some more rural and suburban areas, even Waukesha, the heavily Republican county. Biden cut into Trump's margin there by 7,500 votes.