The Democrat race is very simple, the career criminal and proven Neo-conservative sociopath Hillary Clinton is up against the (by US standards) leftist outsider Bernie Sanders.

Bernie Sanders, along with Trump is the only candidate to have caused any enthusiasm whatsoever for the obvious reason that all of the supposed mainstream candidates are pretending that there is no deep or long term problem with the way the US is run. The Republican candidates pretend that the problems within the US are all the result of the Obama presidency whilst Hillary Clinton is actually recommending more of the same.

Based on this assessment there is literally no hope for positive change coming from the Democrat candidates