Poll: Clinton ahead of Trump in key battleground states

Hillary ClintonHillary Diane Rodham ClintonSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' The problem with Trump's Middle East peace plan Trump's Intel moves spark Democratic fury MORE leads Donald TrumpDonald John TrumpSchiff blasts Trump for making 'false claims' about Russia intel: 'You've betrayed America. Again.' Poll: Sanders leads 2020 Democratic field with 28 percent, followed by Warren and Biden More than 6 in 10 expect Trump to be reelected: poll MORE in three key battleground states, including a big 11-point edge in Pennsylvania, according to a new poll released Tuesday.

Clinton has 48 percent support to Trump's 37 percent in Pennsylvania, the NBC/Wall Street Journal/Marist survey found.

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The Democratic presidential nominee also led in Iowa with 41 percent to Trump's 37 percent, and in Ohio with 43 percent to Trump's 38 percent.

In a four-way contest with Libertarian nominee Gary JohnsonGary Earl JohnsonWeld bets on New Hampshire to fuel long shot bid against Trump The 'Green' new deal that Tom Perez needs to make The Trump strategy: Dare the Democrats to win MORE and Green Party nominee Jill Stein included, Clinton ties Trump in Iowa and her lead slightly narrows in Ohio and Pennsylvania.

"These three states are key ingredients in Trump's formula for success and a region where Trump was hoping [running mate Mike] Pence would provide a boost," said Lee Miringoff, director of the Marist College Institute for Public Opinion.

"Yet Trump is coming up short in his bid to change the electoral map. Given that Clinton has many more paths to the White House, these poll results are a warning sign for the Trump effort."

Both Clinton and Trump have negative unfavorability ratings in all three states. Those numbers are basically unchanged since before both parties' nominating conventions.

"Despite the national spotlight of the conventions focused on each candidate, Clinton and Trump have not made any headway in voters' positive impressions of them," Miringoff said.

The Tuesday poll comes as Clinton has seen a bump in the polls nationally, in battleground states and in traditionally GOP-leaning states.

It also comes hours after Quinnipiac University released a new swing state poll that found Clinton leading in Pennsylvania and Ohio and tying Trump in Florida.

The NBC/WSJ/Marist poll was conducted from Aug. 3-7 and surveyed 899 registered voters in Iowa with a margin of error of 3.3 percentage points; 889 registered voters in Ohio with a margin of error of 3.3 percentage points; and 834 registered voters in Pennsylvania with a margin of error of 3.4 percentage points.