Yes, but that doesn't matter unless there's someone else willing to carry the torch. I come from a five-party system that's way left of modern America, and it still took my party 50 years to get as far as Opposition status.
I want to see him inspire a next generation, and I think he's a great figure to rally around, but we won't see anyone like him in the Oval Office this generation.
EDIT: It would be a bit remiss of me not to touch on this:
Is nationalization of industry assets actually part of Sander's platform? Taking a brief look online, that sort of thing seems to be a hallmark of authoritarian, strong-arm governments - only transportation, finance, and occasionally telecommunications appear to be consistently national industries in 1st-world democracies, even in Europe.
I cannot support the underlined parts. Government control of -every- major industry as you mention, is not a good thing. And I firmly believe that if you have a government more or less controlling every aspect of industry, you cannot have it not be in the private lives of the citizens either. You cannot have one and not the other.
I live in a modern first-world democracy. We've got state-owned enterprises in health care, energy, certain aspects of finance (notably mortgage, housing, and venture capital), transportation, the arts, gas and oil, media, steel, alcohol, gambling, and (until very recently, with a notable decline in customer satisfaction since) telecomms. Would you call Canada (at least, before Harper) an "authoritarian, strong-arm government" that invades its citizens' private lives as a matter of course?
EDIT THE SECOND:
Bernie's got two things going for him for the primaries. The biggest is that he's got a message that the working class is rallying behind. Even if they think it's campaign-talk or what he really believes (I'm inclined to the latter, myself). The second, which is actually a little discouraging, is that I don't think that the majority of the working class is quite ready for there to be a 'First Husband' instead of a 'First Lady'.
So, I do think he's more of a contender than much of the media is painting him to be.
I absolutely think he believes in what he's saying, because frankly his message hasn't changed much in roughly the last decade.