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			 Jeb Bush and other candidates are trying to turn the tide in a 
			campaign that is dominated so far by provocative rhetoric that has 
			played to the strengths of Trump, a bombastic reality television 
			star and developer, and Carson, a soft-spoken surgeon who has been 
			gaining support in opinion polls. 
			 
			The two-hour debate, moderated in Boulder, Colorado, by business 
			network CNBC, will begin at 8 p.m. EDT/0000 GMT Wednesday. 
			 
			With Trump and Carson holding a firm grip on the race in polls of 
			likely Republican voters for the November 2016 election, the forum 
			comes at an increasingly perilous time for lower-ranking candidates. 
			 
			Former Florida Governor Bush, former Hewlett-Packard CEO Carly 
			Fiorina, Ohio Governor John Kasich, former Arkansas Governor Mike 
			Huckabee and New Jersey Governor Chris Christie are under pressure 
			to shake up a race for the party's nomination that so far is tilting 
			away from them with the first voting to take place in little more 
			than three months. 
			  
			  
			 
			Texas Senator Ted Cruz and Florida Senator Marco Rubio also need 
			solid performances to build on recent momentum. 
			 
			Officials from several rival campaigns said they believe the debate 
			could help make Trump and Carson less popular if they are shown to 
			lack knowledge of the intricacies of policy. 
			 
			“If they run this thing well and push people to see if they're smart 
			on the economy and job creation and how fiscal restraint fits into 
			that, you could finally start separating the sheep from the goats on 
			an important issue," said an official in the campaign of one of the 
			Republicans vying against Trump. 
			 
			Republican strategist Kevin Madden said the debate could pose a test 
			for Trump and Carson. 
			 
			"It requires them to no longer just glide by on attributes like 
			being new and bold," said Madden, a former top aide to 2012 
			Republican nominee Mitt Romney. 
			 
			Carson set the table for a debate about the future of sacrosanct 
			entitlement programs by telling "Fox News Sunday" he would use 
			health savings accounts as an alternative to popular Medicare and 
			Medicaid health programs for the poor and elderly. 
			 
			Trump, suddenly behind Carson in some polls, went on the attack on 
			MSNBC's "Morning Joe", saying he did not think Carson would get away 
			with "abolishing Medicare", which Carson denied he would do. 
			 
			In Westerville, Ohio, on Monday, Kasich signaled he would take a 
			tougher tone with Trump and Carson. 
			 
			“I want you to know I’m fed up. I’m sick and tired of listening to 
			this nonsense and I’m going to have to call it like it is in this 
			race,” he said. 
			 
			
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			A Trump aide said the billionaire would be well-prepared to respond 
			to attacks at the debate. A Carson spokesman did not immediately 
			respond to a request for comment.  
			
			Without mentioning Trump or Carson specifically, the campaign of 
			Huckabee, who has offered a detailed "fair tax" plan, said the 
			debate will require candidates to go beyond talking points. 
			 
			"All of them as a whole are going to have to give more than just the 
			topline bullet points of their economic policies," said Huckabee 
			spokeswoman Alice Stewart. 
			 
			Trump frequently touts the business experience that made him a 
			billionaire as reason enough why a President Trump would create a 
			stronger economy. 
			 
			He released a tax reform plan in September that would lower tax 
			rates for all Americans and would pay for the loss of tax revenue by 
			eliminating tax deductions and corporate loopholes. 
			 
			The non-partisan Tax Foundation said it would reduce tax revenues by 
			$10.14 trillion over the next decade when accounting for economic 
			growth from increases in the supply of labor and capital. 
			 
			Carson has proposed all Americans pay a flat tax of 10 percent on 
			income based on the biblical notion of tithing. He would eliminate 
			individual and corporate tax loopholes. He has said his proposal 
			would be revenue neutral for the federal budget. 
			  
			
			
			  
			
			Bush has been active in taking on Trump, and an aide said he plans 
			to do so in Boulder. 
			 
			Bush may have little choice. 
			 
			"Jeb is trailing in the polls, he's got nothing to lose," said David 
			Yepsen, director of the Paul Simon Public Policy Institute at 
			Southern Illinois University. 
			 
			For more on the 2016 presidential race, see the Reuters blog, “Tales 
			from the Trail” (http://blogs.reuters.com/talesfromthetrail/) 
			 
			(Additional reporting by Erin McPike; Editing by Caren Bohan and Ken 
			Wills) 
			
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