The idea that "Real America" is synonymous with "Middle America" is one of the most poisonous memes currently out there in our culture. The coasts (and people/places inland that don't fit the stereotype) are just as real, and just as American.
Now, if you were to ask me what part of the country best represents the whole on average, that's a more interesting question. I keep coming back to the Chicago suburbs as a good representation of the country as a whole; the I-4 corridor in central Florida seems like it would also be quite representative.
Ohio on the whole is representative of America.
Indeed, Sarah Palin sank to a new level of divisive demagoguery, praising people more for 'not' being urban, sophisticated, non-straight, non-Christian, non-Anglo, non-White, and secularist. She suggested a nostalgia for an America that still exists that used to dominate American politics -- but no longer does. Barack Obama is a poor match for that world, to be sure --
People aren't so much where the cattle pastures, grain-fields, and cotton farms are. They are where the concrete and asphalt are. The "Real America" includes the South Bronx, the South Side of Chicago, and "South Central LA".