I'd likely vote for Bernie Sanders, but Rand Paul is also a possibility.
We'll see as more of their views come out and who is on the final ticket. I am not a big fan of Hillary (that is an understatement.)
Voting for Bernie Sanders because he's one of the only real politicians nowadays
^^^
There's no way a Dem. will win the Presidential elections this coming year. If they do i'll be surprised. Then again, anything can happen in a year+ time, and to be quite honest, I really wouldn't doubt it if something did. Majority of our elected officials just need to kick the bucket already.
To the contrary, I would argue the Democrats have a bigger chance of winning this election. If the GOP does not choose a left winged Republican, it is unlikely they will have a chance. There are less-and-less Republicans among younger voters and Republicans need to grab the independent and right-leaning Democrat vote for any chance to win. They will not win based on the Republican voting basis alone.
Issues like Marijuana, Abortion, and Gay Marriage (which will be decided by SCOTUS this June) could destroy any chances they have. While gay marriage may be ruled in favor (I imagine it will) this June, the pushing for policies to "protect" people's religious beliefs via discrimination will hurt candidates. Hell, look at Indiana's Religious Freedom Law (whatever the hell it was called), a few GOP candidates came straight out (Cruz, maybe Rubio) and said it was 100% alright. The Republican party is being painted more-and-more as the party of old white bigoted men.
Currently, I would say the GOP members that have a chance at the nomination are: Scott Walker, Jeb Bush, and Rand Paul. People like Cruz and Carson have absolutely no chance, the Tea Partiers stand no way in hell in winning a national election.
The republican field has yet to really provide a candidate that has a good chance of winning the election. The GOP candidate that could win will need to be one that can attract votes from across the party line.