Travis County, TX? Biden got 71%, yet Bush actually won it in 2000. (Granted, with a plurality thanks to Nader’s strong showing, but Bush still got 47%, a lot more than what Trump received.)
Travis County went from a population of 800k in 2000 and 1.3M in 2020, and the demographics of people moving to Austin skews very liberal.
Trump's 2020 performance in Travis County is actually a record for the Republicans, 161k votes, compared to Bush's 141k in 2000. But when you compare Biden and Gore, it's not even close. Gore got 125k votes. Biden got 436k.
Bush-Biden voters certainly exist in Travis County, but much less than seems at first glance. More an influx of Democrats than flipping of Republicans.
Keep in mind though that turnout was way way higher in 2020 than 2000 so I think 2016 raw vote totals are probably a better stat to use.
