While Clinton still has the lead, there is an even more interesting part of this poll. If you look at it by region, she is gaining a lot of her support from the Columbus area:
|Toledo A||Dayton A||Cincinna||Columbus||Clevelan||SE Ohio|
Obama is within the MOE in Toledo and Cleveland. If he picks up those two areas then he could feasibly win the delegate race in Ohio. To help give you a better idea of the delegate layout in Ohio, here is a map:
I think it will be really hard for Obama to win Southeast Ohio, but Cleveland and Toledo should be obtainable for him. If he can carry Cleveland, Toledo, Dayton and Cincinnati then he could end up winning the delegate race in Ohio.