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 GrassleySenate approves border bill that prevents shutdown Grassley raises voice after McConnell interrupts Senate speech Senate confirms Trump pick William Barr as new attorney general MORE (R-Iowa) with just a 1-point lead over his Democratic challenger and Hillary ClintonHillary Diane Rodham ClintonOvernight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants Sarah Sanders says she was interviewed by Mueller's office Trump: I believe Obama would have gone to war with North Korea MORE with a double-digit advantage on Donald TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE 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 JohnsonThe 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 GOP strategist says Virginia 'just got purple' 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 ReidConstitutional conservatives need to oppose the national emergency Klobuchar: 'I don't remember' conversation with Reid over alleged staff mistreatment Dems wary of killing off filibuster 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.