> This appears in cross-tabulated data. We split the nation's counties into four equal-sized groups, or quartiles, from those with the most COVID-19 cases to those with the fewest. Among registered voters living in counties with the most cases, Biden leads Trump by 72-24%. In the second-highest quartile, it's 62-35%. In the third quartile, results flip, 53-41%, Trump-Biden. And in the quartile with the fewest cases, it's 60-38%, Trump-Biden.
Part of this reflects that fact that there are more Democrats in harder-hit counties and more Republicans in counties with fewer cases. As noted, howe…