Former Gov. Ted Strickland, a Democrat, has a 46 - 40 percent lead over Republican U.S. Sen. Rob Portman, who is up for reelection in 2016, according to a new poll from Quinnipiac University.
Portman tops Cincinnati City Council member P.G. Sittenfeld 49 - 24 percent.
The incumbent has a 49 - 28 percent job approval rating and a 43 - 21 percent favorability. Strickland gets a 47 - 29 percent favorability rating, while 85 percent of voters haven't heard enough about Sittenfeld to form an opinion.
Gov. John Kasich has a 60 percent job approval rating, brushing up against his all- time high of 61 percent April 6.
U.S. Sen. Sherrod Brown has a 50 percent job approval rating.
"Gov. John Kasich was re-elected in a landslide in 2014, while President Barack Obama carried the Buckeye State comfortably in 2012," said Peter A. Brown, assistant director of the Quinnipiac Poll
"Yet Kasich remains a political icon, while Obama might have difficulty winning in Ohio these days, factors which could boost Sen. Rob Portman's re-election chances," Brown added. "But it's too soon to be sure where anyone's numbers will be on Election Day 17 months from now."