Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE has slim leads in Pennsylvania and North Carolina, while Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE has a slight edge in Ohio and the two are tied in Florida, according to a new poll of battleground states released Thursday.

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Clinton, the Democratic presidential nominee, leads in Pennsylvania, 48 to 43 percent, and in North Carolina by a margin of 47 to 43 percent, the Quinnipiac University poll found.

Trump, the GOP nominee, is ahead 46 to 45 percent in Ohio, and the two candidates are tied at 47 percent each in Florida.

"The effect of the Republican and Democratic conventions on the presidential race has run its course. As the campaign enters its final stage, Florida and Ohio, two of the largest and most important Swing States, are too close to call, while North Carolina and Pennsylvania give Hillary Clinton the narrowest of leads," said Peter A. Brown, assistant director of the Quinnipiac University Poll.

"The obvious takeaway from these numbers is that Donald Trump has staged a comeback from his post-Democratic convention lows, especially in Pennsylvania and Ohio. Taking a bit longer view, however, we see a race that appears little changed from where it was as the GOP convention began in July, and at least in these four key states is very much up for grabs."

The poll found Clinton with substantial leads in all four states among women, while Trump has similarly large leads among men.

The polls were conducted from Aug. 29 to Sept. 7 among 761 likely voters in Florida, 751 likely voters in North Carolina, 775 likely voters in Ohio and 778 likely voters in Pennsylvania.

The polls in Florida and North Carolina have margins of error of 3.6 percentage points, while the polls in Ohio and Pennsylvania have margins of error of 3.5 percentage points.