That's sort of the point of this poll. It was of likely 2011 voters, not likely 2012 voters. Assuming Democrats were more fired up about SB5 than Republicans (and the results certainly suggest that), one would expect Obama's numbers to be inflated.
That's probably part of it too. There was absolutely nothing to get excited about supporting for Ohio Republicans on the ballot this year: a union bill no one wants, a judicial reform no one understands, and a healthcare statment that doesn't do anything. Heck, I was wondering why I bothered to get an absentee ballot sent to me. Only one local race was even contested.
It's interesting that PPP decided to do a poll on the day before the 2011 election. I can't believe no one there thought it may be skewed. Wait until next month. I'm not saying the Republicans will be doing well, but it will at least be accurate.