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			 He’s Paul Nehlen, who has emerged as a Republican rival to Paul 
			Ryan, the speaker of the U.S. House of Representatives, in his home 
			district in Wisconsin. Ryan, the most powerful elected Republican in 
			the country, is the epitome of that establishment. 
 While many Republican operatives fear Trump’s tumultuous 
			presidential bid will hurt House and Senate races this year, a 
			handful of candidates like Nehlen are embracing Trump’s message, 
			although not always the man himself.
 
 A loss by Ryan or another high-profile incumbent would send 
			shockwaves through the party and could prompt fellow establishment 
			Republicans to rethink positions on advocacy of free trade and 
			support for immigration reform.
 
 In New Hampshire, where Trump won the nominating contest, or 
			primary, by 20 points, Jim Rubens, a former Republican state senator 
			who has endorsed the billionaire businessman, is attempting to 
			unseat incumbent Senator Kelly Ayotte.
 
			
			 In Arizona, another state Trump won, state senator Kelli Ward is 
			challenging veteran Senator John McCain by talking up securing the 
			border and courting voters at Trump rallies, although she has not 
			endorsed the presidential candidate.
 The dynamic of outsiders challenging establishment candidates is one 
			that has been taking place within the Republican Party for several 
			election cycles, but in Trump, the insurgency has a new, more 
			popular face.
 
 Beyond the races in Wisconsin, Arizona and New Hampshire, it has 
			played out in states like Alabama, where Jonathan McConnell greeted 
			voters outside a Trump rally in Huntsville in a bid to unseat 
			veteran Senator Richard Shelby, and North Carolina, where Rep. Renee 
			Elmers, facing a challenge to her seat, said she had voted for Trump 
			in that state’s presidential primary.
 
 But, unlike the anti-establishment wave that swept Tea Party-aligned 
			lawmakers into Congress in 2010, these candidates do not appear to 
			represent a new anti-Washington groundswell, suggesting there are 
			limits to Trump’s brand of politics, which at times runs deep 
			against Republican orthodoxy on issues such as trade and taxes.
 
 “I been surprised that there haven’t been any Senate or House 
			incumbents that have lost primaries as a result of a groundswell of 
			support for Donald Trump or Ted Cruz,” said Nathan Gonzales, an 
			independent analyst on congressional races in Washington.
 
 Shelby, for example, soundly defeated challenger McConnell in 
			Alabama's Republican primary race in March.
 
 “Other candidates could try to replicate his message, but no one can 
			replicate Donald Trump,” Gonzales said.
 
 Still, many analysts and political operatives believe Republicans 
			unhappy with Trump as the nominee won't vote in the general 
			election, potentially causing Republicans to lose their 
			congressional seats to Democratic contenders.
 TOP TARGET
 It would be easy, to dismiss Nehlen’s challenge to Ryan, who is 
			popular among Republicans inside and outside of Wisconsin and has a 
			large campaign warchest. A poll last month by Marquette University 
			Law School showed him with more than an 80 percent approval rating 
			among Wisconsin Republicans.
 
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			But less than two years ago, Eric Cantor, then the No. 2 Republican 
			in the House of Representatives, was also considered a rising 
			Republican star. He suffered a shock defeat in the 2014 
			congressional elections in Virginia to an obscure conservative 
			college professor, David Brat. Cantor, too, had looked unbeatable.
 “That race is what reinforced in my mind this is possible,” Nehlen 
			said in an interview.
 
 Trump has frequently criticized Ryan for the $1.1 billion budget 
			deal struck with Democratic President Barack Obama last December. 
			And Ryan’s support of trade deals such as the Trans-Pacific 
			Partnership and comprehensive immigration reform is squarely at odds 
			with Trump’s positions.
 
 Nehlen said those two issues motivated him to mount his challenge to 
			Ryan, although he stopped short of saying he embraced Trump's 
			candidacy.
 
 Rubens, who is challenging Ayotte in New Hampshire, isn’t as 
			restrained. ”I admire his independence,” Rubens told Reuters.
 
 Rubens, like Trump, calls for a fence along the southern border and 
			for doing away with so-called “birthright citizenship,” a policy 
			that grants anyone born on U.S. soil a citizen.
 
 Ayotte, a first-term senator, was praised by conservatives when she 
			ran in 2010 and was endorsed by former Alaska Governor Sarah Palin 
			at the height of Palin’s popularity. But she earned their wrath when 
			she backed immigration reform. She also frustrated moderates by 
			voting against a bill that would block suspected terrorists from 
			buying guns.
 
			
			 
			Ayotte, Gonzales said, "is an example of someone who can’t come out 
			guns blazing against Donald Trump. She needs every Republican 
			possible in the state.”
 In Arizona, Ward is challenging McCain, the moderate who was the 
			Republican presidential nominee in 2008, in a state where rancor 
			over immigration issues runs high. Ward has said she supports 
			Trump's claim that Mexico was sending criminals to the United 
			States. Mexico has ridiculed the allegation.
 
 Ward has an opportunity. A poll released last month by the firm 
			Public Policy Polling showed McCain with a 33 percent approval 
			rating among Republicans in Arizona.
 
 (Additional reporting by Susan Cornwell and David Morgan, editing by 
			Caren Bohan and Ross Colvin)
 
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