Biden or Sanders. AT LEAST in the sense that one will win a plurality. Whatever the DNC would do in a contested convention is up in the air. I don't give Buttigieg a chance, and I think Warren is slowly on her way out.
I genuinely think there's a chance that Sanders will outperform the polling. Young people are more politically motivated than ever, and support Sanders by a pretty wide margin. But they're always undersampled in polling, which is technically the correct method by historical results, but I think there are variables here that can change things.
Also, imagine a scenario where Warren drops out shortly before Iowa and endorses Sanders? That would be a huge play to block Biden. Not saying it's gonna happen, but if her numbers keep shrinking, I think she's rational enough to realize when she's not gonna win.
In the end though, it's not about who I want to win, and I have to go with the data. Biden's slip has taken a long time if it's really gonna happen nationally. So I can't deny his chance here.