Biden has flipped the swing voters that Twitter told you didn't exist. This was a smart group for him to focus on, because remember: a new voter is +1 (+1 for Biden), but converting a Trump voter is +2 (-1 for Trump, +1 for Biden). Biden got this from the start. https://twitter.com/NateSilver538/status/1321463399012880385
If you've wondered why Biden insisted on putting some Republicans on stage at his convention, and why he's rhetorically entertained the idea of a Republican cabinet member, here's your answer. https://twitter.com/Yair_Rosenberg/status/1321464013943902208
The reason politics Twitter has a hard time understanding that swing voters exist is because no prominent voices on politics Twitter are swing voters. This is a very partisan and polarized platform and a poor proxy for the electorate as a whole. Campaigns that get this fact win. https://twitter.com/Yair_Rosenberg/status/1321464013943902208
Another important point about swing voters: there don't have to be a lot of them for them to matter a lot. Say they're 3% of the electorate. In a close election, which is most of them in polarized America, that 3% swinging from one side to the other decides the outcome!