He sure as hell was at my (very close to national average demographics district’s) caucus in 2020. Damn near the whole room lined up for Biden nearly instantly. It was the same for Hillary in 2016, btw. These lies people like to repeat on the internet about how one progressive or another has overwhelming support and only loses out due to manipulation by the democratic party are not borne or by reality, and I think are often spread by those trying to either disenfranchise left voters, or are the voters that fell for it and are now doing the dirty work of repeating the lies.
I know what you’re getting at here, but the way you phrased it is 100% wrong. The Republican Party was founded in 1854 as an expressly anti-slavery party.