I think the big issue here is the perpetual confusion of "independent" and "swing voters" with some concept of "centrist" or "moderate" which is generally put out by the press, when in reality these people are often low information voters who are likely to vote for someone "who knows what s/he stands for" instead of someone who has mushy middle distinctions-without-differences policy positions. There are tribal Democrats, tribal Republicans, and some genuine "can be convinced on the issues" voters. But most of the people up for grabs "in the middle" aren't really in the middle in any sense that we understand it. Instead, they vote their gut and are proud of it.This is why the meta of a candidate is so important. It's also why I'm quite sure that Paul Hackett could have beat Mike DeWine as well as Sherrod Brown did. People, and voters, are attracted to confident people who exude leadership (even if it's faux), regardless of ideology. Pick candidates with those traits and you can elect anyone. Didn't George Bush prove this well enough by now?
Besides, if you run a mushy middle candidacy, they're still going to run commercials calling you a crazy liberal who's going to make your son marry a dude and raise taxes to 100%. I see it happen over and over.
I'm a very lucky person with every allergy known to man but still happy to be enjoying a wonderful life living in the best place in the world!