Sweet Square
ˈkämyənəst
Ah my bad. Didn't know he actually won by popular vote in 2004(Christ thats depressing).Bush won the popular vote in the elections of 2004.
What party ? The Democtraic Party is really just a fund raising machine, it's not in the traditional sense a political party(Also Warren to her credit is hated by a major funder of the party - Wall Street, she is to some degree divisive).Most important thing for Dems is to have a candidate which will unite the party. Leftists won't vote Biden, centrists won't vote Sanders (and independents likely won't vote him in large numbers). Warren is not divisive for the party, and IMO has easily the best plan. The only problem for her might be the perceived lack of charisma, and by extension electebility.
As for voters there aren't enough people who describe themselves as lefties(Sadly) or centrists in america to make a difference. Trump won because of Clinton failure to win over working class voters.Both Biden and Bernie(Is there polling to show Bernie isn't popular with independents ?) have a base of voters that could win presidential them election, Warrens base at the moment is literally people like her - highly educated white middle class people, thats not a enough at the moment.