Jon Keeling at Third Base Politics has an excellent summary of the early voting numbers in Hamilton County (a key swing area of Ohio) so far, and they don’t look good for Democrats. Highlights:

And Democrats? Their turnout has reduced by 36%, or about what would be expected in a midterm election.
But Republicans? They are doing the unexpected. They are outperforming what they did in 2008. Pretty amazing.
What makes the Republican advantage so much more impressive? Per the Plain Dealer, Democrats enjoy a 62/38 registration advantage in Hamilton County.