If it was a straight vote or he was a party member I'd agree but as an independent who is getting so smashed by super delegates he has to not just beat Hillary he has to dominate and he has to do as well in South Carolina etc as he does in New Hampshire which just doesn't look possible?
Obama took on Hillary as a member of the senate and long term democrat member and had a lot of support from the, establishment and he had support within the DNC, within the States governors and within the two houses.
I am sure Sanders is a far more honourable and better candidate in many ways and I agree on the areas of support he'll have I just don't think it will matter rightly or wrongly.