August 9, 2016 5:54 PM EDT

New polling reveals that Hillary Clinton has expanded her lead over Donald Trump in three key states after the Republican and Democratic conventions.

The latest numbers from NBC/WSJ/Marist show that in a two-way face-off, Clinton increased her lead over Trump from three points to four points among registered voters in Iowa, from nine points to 11 points in Pennsylvania, and from a tie to a five-point lead in Ohio.

Expanded to a four-way race including Gary Johnson and Jill Stein, the new polls reveal a Clinton-Trump tie in Iowa, a four-point Clinton lead in Ohio, and a nine-point Clinton lead in 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,” Lee Miringoff, director of the Marist College Institute for Public Opinion, told NBC News. “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.”

The NBC/WSJ/Marist polls took place from Aug. 3 to 7 and included between 800 and 900 registered voters in each state, with margins of error of +/-3.3 to 3.4 percentage points.

[NBC News]

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