my politics have evolved from center left in 08 to being quite removed from the spectra represented by any candidate with a serious chance of winning, so the answer has changed over time. Bernie would have been an exact match in 08 but after the Bush admin, I did feel strongly that Obama would be effective and didn't really hate McCain as much as I do these days. 12, I was more worried about what the GOP would mangle if they got in charge and didn't really expect Obama to make any more great leaps. 16 was of course all about paying little attention to the unsavory characters alongside me trying to hold Helm's Deep against the Uruk-Hai
locally I do tend to vote positively as I know many of the candidates personally, though a few of them I know are turds so I vote for literally anybody else to keep them off the Board of Ed, etc.