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 Davis RyanTrump digs in amid uproar on zero tolerance policy Mark Sanford’s troubles did not begin with Trump NY Post blasts Trump, GOP over separating families at border 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 Campbell BrownTrump surprises with consumer agency pick On The Money — Sponsored by Prudential — Trump nominates budget official Kraninger for consumer chief | Senate votes to block Trump ZTE deal | Stocks fall on trade tensions | House panel moves to markup budget Dems must stop picking foxes to guard the financial hen house MORE (D) leading Republican state Treasurer Josh Mandel, 49 percent to 42 percent.

The full PPP can be read here.