You've heard that this presidential race has boiled down to Ohio, and perhaps a few other states. So ... if you are a true politics enthusiast, you need to become expert on Ohio politics and what constitutes a "ground game."
That said, I've found for you a primer on Ohio presidential politics written by Dan Balz and Felicia Somnez of The Washington Post. Balz is about as good a political writer as we have today, trying hard to be this generation's replacement for David Broder. He still leans left, but less than many others.
Unless you're a politics maven, this long article will tell you more than you want to know about Ohio micro-politics. Hat tip to RealClearPolitics for the link.