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			 As the months-long primary season nears its end, Republican 
			leaders appear to have achieved their goal of producing more 
			disciplined Senate candidates who can avoid the kind of campaign 
			blunders that cost the party winnable races in 2010 and 2012. 
 Candidates backed by the party's establishment and business allies 
			secured Republican Senate nominations in states like North Carolina, 
			Colorado and Arkansas that will be hotly contested in November, in 
			some cases beating out rivals backed by the insurgent Tea Party 
			movement.
 
 Tea Party challengers also failed to unseat any of the 12 sitting 
			Republican senators who are up for re-election.
 
 The Republican establishment celebrated another victory on Tuesday 
			when their preferred candidate, former Alaska Attorney General Dan 
			Sullivan, won the nomination to oppose Democratic Senator Mark 
			Begich. Sullivan beat two other contenders, including one endorsed 
			by home-state Tea Party hero Sarah Palin.
 
 
			
			 
			The results have left Republicans upbeat about their prospects in 
			the Nov. 4 elections, when they need to pick up six seats from 
			Democrats to win control of the 100-seat chamber.
 
 "It's the best recruiting class in decades," said Rob Engstrom of 
			the U.S. Chamber of Commerce, which has spent at least $15 million 
			to back business-friendly candidates this cycle.
 
 Many forecasters now give Republicans a slightly better-than-even 
			chance of winning control of the Senate. They are heavily favored to 
			pick up open Democratic seats in South Dakota, Montana and West 
			Virginia, and six other competitive races will be fought in 
			conservative-leaning states that President Barack Obama lost when he 
			ran for re-election in 2012.
 
 Obama isn't likely to be much help for Democrats. His approval 
			ratings have not topped 50 percent since early 2013, and vulnerable 
			incumbents like Colorado Senator Mark Udall have been avoiding him 
			on the campaign trail.
 
 But a favorable political environment is no guarantee of success, as 
			Republicans have found in recent elections.
 
 "One of the things we heard after 2012 is candidate quality 
			matters," said Brad Dayspring, communications director of the 
			National Republican Senatorial Committee, which ran a "candidate 
			school" for hopefuls to bring them up to speed on policy issues and 
			anticipated Democratic lines of attack.
 
 That's a contrast to 2010 and 2012, when undisciplined candidates 
			doomed the party's chances of winning the Senate. Republican 
			candidate Christine O'Donnell lost the Delaware Senate race in 2010 
			after proclaiming she was "not a witch."
 
 In 2012, Todd Akin lost Missouri after asserting victims of 
			"legitimate rape" had the ability to block a pregnancy. Richard 
			Mourdock saw his lead wither away in Indiana after saying a 
			pregnancy resulting from rape was something "God intended to 
			happen."
 
 Those comments also hurt Republicans in other races, as Democrats 
			used them to argue the party was out of touch with mainstream 
			voters.
 
			
			 
			
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			"One thing Democrats were really good at was taking the Todd Akins 
			and Richard Mourdocks and Christine O'Donnells of the world and 
			using them to infect other Senate campaigns," said Jennifer Duffy, 
			an analyst with the nonpartisan Cook Political Report. This year, 
			Republican Senate candidates with a flair for controversy won't be 
			on the ballot in November.
 U.S. Representative Paul Broun, who called biological evolution and 
			the Big Bang theory "lies straight from the pit of Hell" finished a 
			distant fourth in the Georgia Senate primary in May. Milton Wolf, a 
			radiologist who joked about gunshot victims on Facebook, fell short 
			in his bid to unseat Kansas Senator Pat Roberts earlier this month.
 
 Chris McDaniel, a Tea Party favorite who made sexually suggestive 
			comments about Hispanic women on a radio show, narrowly lost a 
			challenge to Mississippi Senator Thad Cochran.
 
 Meanwhile, Democrats have been playing defense in Iowa after their 
			nominee Bruce Braley drew negative attention for threatening to sue 
			a neighbor over unfenced chickens and disparaging the farm state's 
			senior senator, Republican Charles Grassley, as a "farmer from Iowa 
			who never went to law school."
 
 Democrats say Senate candidates backed by the Republican 
			establishment are no sure bet, having lost in recent years in 
			Montana, North Dakota, Wisconsin and Virginia.
 
 This year, Republicans like Tom Cotton in Arkansas and Corey Gardner 
			in Colorado will have to explain their votes in the House of 
			Representatives on contraception, farm policy and other issues that 
			could alienate a statewide electorate, said Matt Canter of the 
			Democratic Senatorial Campaign Committee.
 
 
			 
			"What makes a candidate loved by the Republican establishment is 
			sometimes the thing that makes them detested by voters," Canter 
			said.
 
 Still, Republicans like their chances.
 
 "At the end of the day, this all comes down to product. The product 
			out there, the candidates, are of much stronger caliber than in 
			previous election cycles," said Paul Lindsay, spokesman for American 
			Crossroads, a Republican "Super PAC" that has spent at least $5.7 
			million in political races so far this year.
 
 (Reporting by Andy Sullivan; Editing by John Whitesides and Cynthia 
			Osterman)
 
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