It could easily happen. Say what you will about Biden, he's uninspiring and has a sketchy record on pretty much everything. I can't speak for whomever "Bernie Bros" might be but as a progressive I'm looking at 2024 and whether I'd rather have a lame duck Trump or an 80 year old Biden. It's probably going to depend entirely on his VP choice.
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Good coffee, good weed, and time on my hands...