It's hard one. Biden, Sanders and Warren would all be too old.
I don't think Warren would be too old as long as she manages to be as spry as Bernie (of course who knows if that'll be the case). Plus she'd likely be facing a 74-year old Donald Trump.
Yeah. Nobody cares how old she is. Not only is Trump 70, but he's 70, a poonhound, and eats like an
animal 
And the American people are like, whatever, he's fit enough.
Cory Booker,
Important to cement college whites and minorities.
He would likely do neither.
My nightmare is Cory Booker. Nobody wants him except for the exact kind of MSNBC loving, Starbucks drinking, suburban liberal who unfortunately votes in primaries. Mark my words, Trump would beat this wet towel if he were the nominee. Nobody outside of the progressive liberal elite bubble thinks that this guy is that great.
Not a Democrat, but this:
1. JBE
2. Brian Schweitzer
3. Jim Webb
4. Jim Justice
5. Gwen Graham
6. Harold Ford Jr.
7. Jon Tester
8. Bob Casey Jr.
9. Steve Bullock
10. Alternate reality non-scumbag John Edwards
is a pretty good list.
This is also just insane to me. First of all, except Tester and Bullock, none of these folks are getting out of a primary. Second of all, half of these folks love oil, so kiss environmentalists goodbye. Half of these folks aren't exactly great on choice or gay rights, so kiss Millennials goodbye. Jim Justice thinks that climate change is "I dunno!"
All it would have taken is half the Jill Stein voters in Michigan and Wisconsin to win those states people! And think about the leftwing voters who didn't turn out (and the center-right voters who voted for Trump anyway despite Hillary's overtures). It's time for the party to wake up and smell the reality that 3rd-Way, coal-loving white guys from states that we won't win in a presidential are not the answer here.
/rant
So my list, then:
1. Warren. Very underrated. Connects with normals very well. Has an easily digestible economic narrative
2. AL FRANKEN! The Anti-Trump
3. Bernie. Hate the guy, but the regular Joes love him.
4. Sherrod Brown. I would be nervous about giving up his Senate seat, and he's a SWCM which is not ideal, but he could do the job fine I think.
5. Catherine Cortez Masto. She did a helluva job winning a seat that Joe Heck probably had an advantage in through October. She's also a lot more relatable to normal people than Kamala Harris. Very underrated.
7. Tammy Duckworth. Bump up to 2 if Trump. She's got a great story.
7. Kamala Harris. I don't know if she is too condescending for normal folks though.
For the love of God please no list:
1. Hickenlooper.
2. Booker.
3. McAuliffe
I won't list Jim Justice because he won't be nominated under any circumstances.
