A total of 1,108 adults, including an oversample of 305 adults living in 15 battleground states (Arizona, Florida, Georgia, Iowa, Maine, Michigan, Minnesota, Nevada, New Hampshire, New Mexico, North Carolina, Ohio, Pennsylvania, Texas, and Wisconsin) were interviewed by telephone nationwide by live interviewers calling both landline and cell phones. Oversampled states have been weighted to represent their proper share of the adult population. Interviews were conducted in English and Spanish. Among the entire sample, 31% described themselves as Democrats, 27% described themselves as Republicans, and 42% described themselves as independents or members of another party.
http://cdn.cnn.com/cnn/2020/images/08/16/rel8a.-.2020.pdf
what we're seeing here is more like the dreaded squeeze that i've been hearing about my whole life; the idea that gen x is going to get flattened between the milennials and boomers, who are broadly more similar to each other than either is to gen x.