The new survey of Ohio by Public Policy Polling (D) gives Republican Senate candidate Rob Portman a narrow lead in the race for the open seat of retiring GOP Sen. George Voinovich. But more importantly, a lot will ultimately ride on President Obama's popularity or lack thereof in November -- and as of right now, Obama is not doing too well in Ohio. The poll of registered voters finds that Portman, a former Congressman and ex-Bush administration official, leads Democratic Lt. Gov. Lee Fisher by 41%-36%, and has a statistically insignificant edge of 38%-37% over Dem Secretary of State Jennifer...