Polls: Clinton's lead over Trump increases in three Midwest batt - KWWL - Eastern Iowa Breaking News, Weather, Closings

Polls: Clinton's lead over Trump increases in three Midwest battleground states

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(NBC) -

Democrat Hillary Clinton leads Republican Donald Trump in three key Midwest battleground states after the conclusion of the political conventions, including in all-important Ohio, according to a trio of new NBC News/Wall Street Journal/Marist polls.

In Iowa, Clinton is ahead of Trump by four points among registered voters, 41 percent to 37 percent, with the rest saying neither, other or they're undecided. (Before the conventions, Clinton was up by three points in the state, 42 percent to 39 percent in last month's NBC/WSJ/Marist poll.)

However, Clinton and Trump tie at 35 percent, not including their running mates. 

In Ohio, Clinton holds a five-point advantage over her Republican opponent, 43 percent to 38 percent. (The two were tied before the conventions at 39 percent each.)

And in Pennsylvania, Clinton has expanded her lead over Trump to 11 points among registered voters, 48 percent to 37 percent. (Her lead was nine points before the conventions, 45 percent to 36 percent.)

"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," says 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."

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