Poll: Trump up 8 points in Iowa
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Donald TrumpDonald John TrumpFive takeaways from Gillum and DeSantis’s first debate GOP warns economy will tank if Dems win Gorbachev calls Trump's withdrawal from arms treaty 'a mistake' MORE opened up an 8-point lead over Hillary ClintonHillary Diane Rodham ClintonSanders thanks Iowa voters for giving momentum to progressive agenda Manchin wrestles with progressive backlash in West Virginia Arizona newspaper backs Democrat in dead heat Senate race MORE in Iowa, a new poll finds.

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Trump has 45 percent support to Clinton's 37 percent, according to a new Monmouth University survey released Thursday. Libertarian nominee Gary JohnsonGary Earl JohnsonThird-party voters made it difficult to predict 2016, says pollster A Senator Gary Johnson could be good not just for Libertarians, but for the Senate too Clinton would beat Trump in landslide in 2016 re-run, says Hill.TV poll MORE had 8 percent, while Green nominee Jill Stein received 2 percent.

Trump led a July edition of the same poll by 2 points.

The GOP presidential nominee has improved among independent voters, leading Clinton, his Democratic rival, 44 percent to 29 percent.

But both are still plagued by negative favorability ratings.

“Iowa is one of the few places where Trump has been able make inroads among voting blocs that generally support Clinton,” said Patrick Murray, director of the Monmouth University Polling Institute.

Trump has been gaining ground in the polls both nationally and in several battleground states. Clinton now leads Trump by less than 2 points nationally, according to a RealClearPolitics polling average.

Thursday’s poll comes one day after Monmouth University released a poll in Nevada that showed Trump overtaking Clinton by 2 points.

The new poll also showed incumbent Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyGOP plays hardball in race to confirm Trump's court picks Trump officials ratchet up drug pricing fight Dems angered by GOP plan to hold judicial hearings in October MORE (R-Iowa) up 17 points over his Democratic rival, former Lt. Gov. Patty Judge.

Grassley has 56 percent, with Judge at 39 percent.

Grassley has expanded his lead since July, when he led Judge by 10 points. His favorability rating has also improved, with 50 percent saying they view the GOP senator favorably, while 29 percent view him unfavorably. Judge has a positive favorability rating as well, but she’s relatively unknown; 52 percent have no opinion.

The poll was conducted from Sept. 12 to 14 and surveyed 404 likely voters in Iowa via phone. The margin of error was 4.9 percentage points.