I'm at least Obama 12/anti-Hillary 16. Heck, one of the first reasons I supported Obama in 2008 was as a bulwark against Hillary, whom I was adamantly against from an anti-dynastic, anti-Iraq War point of view (not to mention that Obama's charisma really captivated me). Since then, my opinion of both Obama and Hillary (and liberalism in general) has declined considerably, but I was never a Romney fan (voted for Santorum in the 2012 caucus) as he was far too much of a Wall Street elitist type, and I didn't believe him on social issues for a second.
I think this is a pretty common orientation, but I doubt that it's one that will produce many votes for Trump. Third parties, non-participation, and undervoting, will be more compelling options for most.
As for the actual Obama/Trump voters, we all realize that low information votes are very much a thing, right? Plenty of ballots are cast amidst of ignorance and incoherence, especially when a voter is not in the habit of voting along party lines. They don't need to make sense.
