To be fair, Biden polls similarly well against Trump:
https://projects.fivethirtyeight.com...eral/national/
But going state by state, the purple states Trump flipped aren't looking great for any dem right now.
I'm still not convinced any candidate is going to bring out the youth vote enough to make a significant impact (I guess we'll see as the primary goes on). Bernie also brings the risk of alienating the middle of the road, older democrats (with a stronger track record of voting)