Iowa poll: Clinton up 14 on Trump, Grassley in tight race with Dem
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A new poll of Iowa shows Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyDem: 'Bulls---' to say GOP doing everything to contact Kavanaugh accuser Grassley wants unredacted version of letter from Kavanaugh's accuser Attorney for Kavanaugh accuser criticizes Senate panel's ‘rush to a hearing’ MORE (R-Iowa) with just a 1-point lead over his Democratic challenger and Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump's exclusive interview with Hill.TV | Trump, intel officials clash over Russia docs | EU investigating Amazon | Military gets new cyber authority | Flynn sentencing sparks new questions about Mueller probe READ: President Trump’s exclusive interview with Hill.TV Keeping up with Michael Avenatti MORE with a double-digit advantage on Donald Trump in the presidential race.
While the gap closes in the Loras College poll when third-party candidates are listed, it suggests Trump, the presumptive GOP presidential nominee, faces an uphill climb in the Hawkeye State and that he may be hurting the six-term Republican senator. 
Clinton has 48 percent support to Trump’s 34 percent in a head-to-head match-up. 
When Libertarian Party nominee Gary JohnsonGary Earl JohnsonRand Paul endorses Gary Johnson's Senate bid The Hill's Morning Report — Trump casts energy, land policies as gifts to red-state voters Poll finds Libertarian Senate candidate running ahead of GOP in New Mexico MORE and Green Party candidate Jill Stein are added, Clinton's lead narrows. In that scenario, she has 44 percent, with Trump at 31 percent, Johnson at 6 percent and Stein at 2 percent.
“I think third-party candidates, especially libertarian Gary Johnson, have their sights set on having 2016 be a breakthrough year. Both Johnson and Stein seek to capitalize on voter dissatisfaction and the lack of widespread enthusiasm of the Democratic and Republican candidates,” said Christopher Budzisz, director of the Loras College Poll. 
General election polls in Iowa are sparse, but a Public Policy Polling survey earlier this month gave Clinton a 2-point lead over Trump. 
The Senate poll shows Grassley with 46 percent support and Democratic challenger Patty Judge with 45 percent.
The tightening of the race comes as Grassley, the head of the Senate's Judiciary Committee, and his fellow Republicans continue to refuse a hearing for President Obama's Supreme Court nominee, Merrick Garland.
Budzisz noted that despite the poll result, Grassley would not be an easy person to take down in November. 
“Senator Grassley is something of an institution here in Iowa, but Democrats are hoping to use his refusal to hold a Senate hearing on President Obama’s Supreme Court nominee against him," he said. 
"I think they are also hoping for a negative down-ballot effect created by Trump as the presidential nominee. Senator Grassley will not be easy to unseat, however."
While the poll shows the results of the race are close, 70 percent of those surveyed said they expect Grassley to win. 
"Still, in this volatile year, Senator Grassley appears to be facing a tougher challenge than most people would have predicted earlier this year," Budzisz added. 
A Public Policy Polling survey from earlier in June showed Grassley with a 7-point lead over Judge. 
Adam Jentleson, Senate Minority Leader Harry ReidHarry Mason ReidKavanaugh furor intensifies as calls for new testimony grow Dems can’t ‘Bork’ Kavanaugh, and have only themselves to blame Dem senator: Confidential documents would 'strongly bolster' argument against Kavanaugh's nomination MORE's (D-Nev.) deputy chief of staff, tweeted Thursday that Grassley is struggling in the polls because voters are rejecting the GOP blockade of a Garland Supreme Court nomination. 
"The game has changed, folks — and it's because McConnell decided to block Garland," he tweeted
The Loras College poll surveyed 600 likely voters from June 24-28 and has a margin of error of plus or minus 4 percent. 
—Updated at 2:57 p.m.