There are 16 congressional districts in Ohio and Republicans won 12 of the elections and Democrats won 4 of the elections. The votes for Democrats that ran for Congress in Ohio totaled 2,167,166 whereas the Republicans garnered 2,690,353 votes. In other words, the Republican candidates gained 500,000 more votes in the Congressional elections than did their Democrat counterparts.
When you compare the congressional elections to the Presidential election something strange happens. In the Ohio vote count, Obama got 500,000 more votes than did his Democrat congressional counterparts. Specifically, he garnered 2,695,125 votes while Romney had a slight dropoff off from Republican congressional candidates of 2,588,711. So what we are asked to believe is that almost 500,000 people voted for Obama as President but didn't vote for the Democrat congressman in their district. I would be very interested to hear non-fraud based theories which explain this discrepancy.