I thought Ohio Early voting actually favored Romney due to lower Obama turnout than 2008.
Romney is outperforming McCain, but he will need to win by quite a bit more than McCain did on E-Day to carry the state. This is likely considering past elections, but if you believe the polls, then logically Ds that haven't voted in early voting may turn out on E-Day and keep that from happening.
But, yeah, it certainly does. It's not as obvious in OH as it is in CO, IA, and (if Mayor Hancock is correct, which may not be true) WI.