This is a question for American leftists, democrats, progressives, liberals etc not conservatives or independents and moderates, or really anyone who is giving a second thought to voting democrat in 2016
Do you have a problem with any of the Democratic nominee's? That is to say, if any of the candidates running this year for the democratic nomination got elected president, would you be upset, or even really mind?
Looking at your political lean (and you can look at mine), I'm probably not your target audience here, but I will answer:
I am most happy with Bernie Sanders. Sanders has stood on the right side of history, in terms of real political options, for nearly 4 decades. He was on the right side of history on income inequality, civil rights, gay rights, American imperialism, and so forth, and he's genuine and he cares for the American people and has proctored actual sensible solutions to middle-eastern violence. Basically, he's a step in the right direction, and beyond a shadow of a doubt, when compared to the people who've run for office over the past 7 decades, no one has deserved to sit in the Oval Office more than Bernie Sanders. He's a good, strong center-left candidate.
Hillary Clinton is another center-right Democrat who's 100% for the establishment, she's literally been bought off by Wall Street like every other establishment Republican and Democrat, but she's more nobly intentioned than any Republican candidate. Under her presidency, she'd is a neocon so we can only expect serious human rights violations across the world --again, fewer than any Republican, but still terrible-- due to her abhorrent foreign policy views.
Martin O'Malley is a less bought-off but still very establishment Democrat. He'd be considerably better than Hillary in terms of actually occasionally supporting the lower and middle classes and environmental issues, so maybe he's a full stop centrist candidate. But he wouldn't be too wildly different than a Hillary Clinton presidency.
But again, the Republicans are so far off the spectrum in terms of right-wing extremism (Donald Trump is nearly openly a fascist at this point, and he's the leading candidate), I'm forced to vote blue even though I hate Democrats and the Democratic establishment (Debbie Schultz can go f*** herself as far as I'm concerned). But there needs to be a slow reform of the Democratic party to support actual left-wing politics.