I can't say if Chuck Todd was correct, but I can report what he just told his panel on MSNBC, which I quote: If you've spent any time among Sanders supporters, you'll find that they are defiantly anti-Clinton.
Now of course it can't be that all Sanders supporters are defiantly anti-Clinton. However if a significant number are, then there's a magnitude of self-destruction taking place within the Democratic Party that neither Donald Trump's nor the Koch brothers' money could ever buy.
If Chuck Todd was correct, it's safe to say that the defiant ones truly know not what they do -- but in the years to come, there will be no Democratic Party forgiveness. For that matter, there won't be much of a Democratic Party, which will have joined Republicans in a populist meltdown.
Again, I can't say if Chuck Todd was correct. But the founders sure were. Small-d democrats are frighteningly susceptible to political flimflam.