Ridge's proximity to Ohio is about as relevant as Pawlenty's to Wisconsin.
The main problem with the neighboring state advantage: Even if people know who someone is, that doesn't mean they have a strong opinion of them. My parents know who Pawlenty is (thanks mostly to WCCO talk radio when they're visiting down here), but that doesn't mean they can tell you anything about him other than that he's the governor of Minnesota or have an opinion strong enough of him to influence their vote either way.
You just described about half of the Presidential electorate.