Polls show tight races in Ohio, Pennsylvania and Michigan
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Hillary ClintonHillary Diane Rodham ClintonTrump rips Krugman, NYT after columnist writes GOP no longer believes in American values Klobuchar jokes to Cuomo: 'I feel you creeping over my shoulder' but 'not in a Trumpian manner' Dems seek to rein in calls for impeachment MORE and Donald TrumpDonald John TrumpRussia's election interference is a problem for the GOP Pence to pitch trade deal during trip to Michigan: report Iran oil minister: US made 'bad mistake' in ending sanctions waivers MORE are tied in Ohio, while Clinton, the Democratic presidential nominee, leads her GOP rival in Michigan and Pennsylvania, according to new polls that find tight races in three crucial Rust Belt states.

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Three Emerson College polls released Monday found that Clinton and Trump each have 43 percent support in Ohio, while she leads him by 5 points in Michigan, 45 percent to 40 percent, and by 3 points in Pennsylvania, 46 to 43 percent.  

Libertarian presidential nominee Gary JohnsonGary Earl JohnsonPotential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Former Mass. governor takes step toward Trump primary challenge MORE received 10 percent support in Ohio and 7 percent in Pennsylvania and Michigan. Green Party nominee Jill Stein got 3 percent support in Michigan and 2 percent in Ohio and Pennsylvania.

Trump is doing better among independents in all three states, pollsters found. He has a 17-point margin over Clinton among those voters in Ohio but has a much more narrow lead in Michigan and Pennsylvania.

Both Clinton and Trump face negative favorability ratings in all three states.

Clinton leads among female voters by double digits, and Trump has an edge among male voters.

Clinton is also leading among young voters in Ohio and Pennsylvania, but Trump holds a 12-point lead for voters between the ages of 18 and 34 in Michigan.

The polls of 800 likely voters, conducted from Aug. 25 to 27 in Ohio and between Aug. 25 and 28 in Pennsylvania and Michigan, have margins of error of 3.4 percentage points.