One is that he doesn't have enough specificivity on issues. That one's been pretty well knocked down.
Second is that he's not a real Democrat. I've crushed that one.
Third is that he's got an ego.
Well, let's examine that more.
First of all, about all politicians have big egos.
That said, some have bigger than others, like Jon Edwards and covering up being a baby daddy. Or Ralph Nader, who in 2000 had a bigger ego than either Bush or Gore. This includes Mr. "Clean" and Mr. "Green" [actually, not totally on the former, not a lot on the latter] holding oil stocks during the 2000 election under either the theory that Dems wouldn't find out, or that Nader's Raiders types wouldn't care.) (His ego was enough of an issue, and these specific issues enough of an addition, that I didn't vote for president in 2000, and it's a choice I stand by today.
Well, a Rolling Stone interview with Sanders raises this issue.
So how do you do it? (How do you get your program passed?) What are the specifics that allow you to—
What are the specifics about how I, personally, all by myself, do what nobody in American history has done?
Tosh. You’re a Great Society, or New Deal 2, Democrat. There’s Democratic consultants out there who would respect your message, yet brought oodles of experience. In reality, this is about crafting a mix of insurgent/outsider imagery, and you (and wife Jane) wanting pretty tight control of the campaign, I think.
Or now, something new.
It's great that Sanders is (mildly?) raising questions about the Clinton Foundation.
But Ken Silverstein wrote about it 4 months ago. So why didn't Bernie talk then?
Anyway, let's take this back to legacies.
I think this is why Bernie took so long to jump in, specifically his apparent wait on Warren. If she had come in later, it would have made him possibly look not progressive enough. That and the fact she probably would have outdrawn him on votes would have hurt that legacy.
Survey says, in conclusion: Yes, he's an egotist in ways. Probably no more than an average US presidential candidate, but contra any turd-polishing, probably no less, either.