President Obama is leading Republican challenger Mitt Romney by five percentage points in Ohio, according to a poll released Saturday, despite surveys showing the presidential race becoming tighter in other swing states.

The survey, from Democratic-affiliated Public Policy Polling (PPP), shows Obama leading Romney in Ohio, 51 percent to 46 percent.

The margin is wider than PPP’s last poll of Ohio, taken before Obama and Romney’s first debate, which the GOP challenger was widely seen as having won. The pre-debate PPP poll of Ohio found Obama leading Romney, 49 percent to 46 percent.

Polls by other organizations have shown Romney drawing to a virtual tie with Obama since the two men debated on Oct. 3. Several surveys have shown Romney ahead nationally, and drawing closer in many battleground states that have been heavily targeted by both campaigns.

Perhaps no state is as crucial to each campaign’s strategy as Ohio. No Republican has ever won the White House without the Buckeye State's 18 electoral votes, and the path for Romney to 270 electoral votes without Ohio appears to be complicated.

Both Romney and his vice presidential running mate, Rep.  Paul RyanPaul RyanBlack Caucus calls on Ryan to remove Nunes as Intel Committee chair Governing means supporting AHCA Overnight Healthcare: Insurers face big choice on staying in ObamaCare | HHS chief Price grilled over budget cuts MORE (R-Wis.), were campaigning in Ohio Saturday, and Obama has visited the state more often than any other battleground this year.

The PPP Ohio poll also showed Sen. Sherrod BrownSherrod BrownOvernight Finance: Dems seek probe of acting SEC chief | Defense hawks say they won't back short-term funding | Senate seen as start point for Trump infrastructure plan | Dems want more money for IRS Senate Dems call for investigation of acting SEC chairman Dems wait for GOP olive branch after ObamaCare debacle MORE (D) leading Republican state Treasurer Josh Mandel, 49 percent to 42 percent.

The full PPP can be read here.