From the Columbus Dispatch:

As a result of concerns about the reliability of touch-screens and long lines at the polls, Secretary of State Jennifer Brunner ordered Franklin County and the 52 other counties using the electronic machines to make paper ballots available on Election Day.
But while elections officials say it’s difficult to predict how many voters will opt for a paper ballot, they plan to count them only after all the electronic votes are tallied — meaning final vote totals could be delayed in some counties until early in the day after the election.
“It could be Wednesday morning before (final) results are released,” said Shannon Leininger, director of the Ashland County Board of Elections and president of the Ohio Association of Election Officials.

Then again, nobody wanted to call Ohio last cycle, either, even though a bunch of us did the math and figured there was just about no way Kerry could catch up in provisional ballots.