Well, people said Obama can't win and look at us now! If we don't make the utmost effort, how will we know, if the dream could have come true?

I think, that Bernie has a greater chance of being acceptable to swing groups, new voters, some lower-income groups within Republican voters (they would hate to vote for a Clinton and especially for a woman). Yes, it is true that Hillary has name recognition, and Democratic establishment support - but those things aren't looked at well by many, there are people saying that they would rather not vote than vote for that 'two-faced Walmart stooge'. (Voting for her, because she is the lesser Evil is just wrong.) Do we want people to protest the Democratic Party by voting for the Greens, and splitting the vote against the Republican Party?!

Obama, for the last two terms, won precisely because larger sections of the youth, and POC/Black populace came out in support. Bernie has always supported the issues that are important, nay pivotal for the future wellbeing of these groups. If Hillary turns these groups away from voting, (when already after the Democratic period it is expected that the Republican wave is coming - and Obama's squandering of first term majority to compromise meant the interim elections had few of the earlier enthusiastic block come out to vote) then the Democratic Party loses the bump they had been depending on! Democrats cannot afford to play safe this time - they must go harder and actually let the populace know why Bernie would be the better choice. If people come to know of Bernie - they would be swayed towards him. If you talked to more people, with conviction and facts, I believe at least a few would change allegiance to him.

About Hillary - as a fellow woman, some 10 years back, I did look up to her, and wished she would be president. But, the information that has come out about her - Goldwater!girl, emails, Benghazi handling, mudslinging attacks on Obama last time and already a stupid one on Bernie, her links with big companies, her family foundation's shady dealings - she is presently as dislikable as Tony Blair to vast numbers of Feminists/Liberals/Progressives. She has throughout her political career changed stances only when those issues became publicly accepted, not because she believed in them. Even her support for women's issues hasn't been earnest about the hard choices, but always foregrounded the photo-op easy options. I don't think one should opt for her just because she has higher chance to win - she will win probably, but we will lose!

Jeb Bush is the establishment choice, and yes he has a good chance of winning. But his name is anathema to many, his Mexican wife will turn off the pro-Trump racist/xenophobic/anti-immigrant Republic fringe, and if the GOP does choose him - then Hillary will be the 'hate her' lightning rod that will galvanize the misogynist religious base, the Tea Party insular-economists, and the general support base which remembers the drubbing Bill gave them, to vote against her (not for Bush). Choosing Hillary will be THE MISTAKE!