President Obama's frequent trips this fall to Ohio on behalf of Democratic candidates may not be making a difference, a new poll suggested Tuesday.

A Quinnipiac University survey of voters in the Buckeye State found that most said Obama's stumping on behalf of incumbent Gov. Ted Strickland has had no effect on how they plan to vote.

Fifty-eight percent of likely voters in Ohio said that Obama's campaigning made no difference on how they planned to vote, while 32 percent said the president's efforts made them less likely to support Strickland. Only 9 percent said Obama's campaigning made them more likely to support Strickland for reelection.

The president, along with Vice President Biden and other top administration officials, has made frequent trips to Ohio this fall to campaign on behalf of Strickland, Senate candidate Lee Fisher and a slew of House Democrats who are facing very difficult GOP challenges this fall. The state, which often serves as a bellwether for the nation during presidential cycles, has arguably received more attention from the Obama administration than any other in the 2010 campaign.

Obama was most recently in the state on Sunday with first lady Michelle Obama for a "Moving America Forward" rally at Ohio State University.

But the president's own approval ratings in the state have trended negatively since he won it in the 2008 election, 52 percent to 47.

Fifty-six percent of likely voters in Ohio told the Qunnipiac poll that they disapprove of the way Obama's handling his job, while 40 percent approve.

The poll, conducted Oct. 12-17, has a 2.8 percent margin of error.