Sanders is. Sanders could well trail narrowly in the national popular vote and win the electoral college.
Though Sanders-Klobuchar together would be an amazing Democratic ticket.
I used to believe this, but Sanders isn't exactly knocking it out of the park in the rural NE/Midwest compared to the 2016 primary. The best possibility for a Dem to win the EC while losing the PV probably involves Texas flipping by 0.5% while the Republican gets >60% throughout the non-IL Midwest and only loses IL by like 10. 2020 is very likely too soon for that, but I could see it in 2024 or 2028.