I was thinking about negative bellwethers, which are things that generally pick the losing candidate. A positive popular vote bellwether could be New Mexico dating back to 1964. This means it always picked the candidate winning the national popular vote for president. I was thinking about the opposite: a negative bellwether county. This is the best example of a negative popular vote bellwether I could find: Vermont gubernatorial elections relative to presidential elections in presidential years and House relative to the election 2 years after (midterm):
Year, VT voting for winning party nationally 2006, No 2008, No 2010, No 2012, Yes 2014, No 2016, No 2018, No 2020, No
At the county level (for president), what is the longest negative bellwether streak? Such a county, from 2000 on, would vote Bush, Kerry, McCain, Romney, and Trump. What county has done this?