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			 The conservative challengers in the case aim to persuade Roberts 
			and the other eight justices that the federal government has 
			overreached by providing tax subsidies to millions of people in 34 
			states that didn't create their own insurance exchanges. 
			 
			Their argument will revolve around wording in the 2010 law that 
			insurance would be provided through exchanges “established by the 
			state,” which they argue rules out a federal role. 
			 
			But in several key cases in recent years Roberts has voted in ways 
			that could favor the government's arguments. He has raised concerns 
			about upsetting the balance between federal and state law, 
			particularly when there is ambiguity in a law's wording. He has also 
			recognized the need to consider the overall context of a law, not 
			just an isolated phrase. 
			 
			The government says the Obamacare law, read as a whole, shows the 
			subsidies were intended to be available nationwide. 
			 
			Oral arguments are set for March 4, with the ruling expected by the 
			end of June. If the challengers win, millions of people in states 
			that do not have their own exchanges would lose the subsidies, 
			dealing a potentially crippling blow to Obamacare.   
			
			  
			 
			Appointed by Republican President George W. Bush in 2005, former 
			corporate lawyer Roberts joined the court's liberal wing in the 2012 
			case, which ruled Obamacare was constitutional. 
			 
			Roberts may be the most likely of the five conservative justices to 
			side with the four liberals on the court, but Anthony Kennedy, often 
			the swing vote in close cases, could also be in play for the 
			government. It is, however, difficult to predict how any individual 
			justice will vote, particularly before hearing his or her questions 
			at oral arguments. 
			 
			Although the recent cases testing the interpretation of statutes are 
			on a range of subjects, they give an insight into the legal 
			methodology that Roberts uses. 
			 
			STATE RIGHTS 
			 
			Last year, Roberts wrote an opinion in a criminal case in which he 
			cited states' rights in relation to Congress’ power to implement 
			treaties the U.S. government has signed. Lawyers for a Pennsylvania 
			woman accused of trying to poison her husband's lover said Congress 
			had overstepped in interpreting a treaty to cover crimes involving 
			household chemicals. 
			 
			In throwing out the woman's federal conviction under a chemical 
			weapons law, Roberts signaled his concerns about infringing on the 
			rights of the states, which usually play the lead role in 
			prosecuting such crimes. If there is ambiguity in a statute, he 
			wrote, the court should attempt to interpret the law in a way that 
			does not harm the states. 
			 
			
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			The government has cited that case in support of its Obamacare 
			defense, arguing that a ruling against the law would similarly have 
			an unintended negative impact on states. The healthcare law does not 
			explicitly say that subsidies would be denied to people in states 
			that did not set up exchanges. 
			
			Jonathan Adler, a professor at Case Western Reserve University 
			School of Law and one of the architects of the challengers' legal 
			theory, conceded in an interview that the states' rights question 
			could appeal to Roberts and Kennedy. 
			 
			"I think that's a serious argument," he said. 
			 
			The government is also highlighting a case from 2014. Then, Roberts 
			was in the majority in partially upholding the Obama 
			administration's first regulations to address climate change. 
			 
			Roberts signed on to conservative colleague Antonin Scalia's 
			majority opinion, which stressed the notion that interpretation of 
			statutory language concerns not just the specific phrase at issue 
			but also the broader context. Along with Kennedy, Roberts has voted 
			most often since 2005 to support a government agency's 
			interpretation of the law, according to a 2014 survey by Jack 
			Beermann, a professor at Boston University School of Law. 
			 
			Roberts has not always deferred to the government, even if warned of 
			major consequences. In January, he rejected the government's 
			interpretation of a whistleblower law despite what he conceded were 
			genuine security concerns about the disclosure of sensitive 
			information. He threw the ball back to the Republican-controlled 
			Congress, as he could do with Obamacare. 
			 
			"Those concerns are legitimate. But they are concerns that must be 
			addressed by Congress or the president, rather than by this court," 
			Roberts wrote. 
			 
			(Reporting by Lawrence Hurley; editing by Stuart Grudgings) 
			
			[© 2015 Thomson Reuters. All rights 
			reserved.] 
			Copyright 2015 Reuters. All rights reserved. This material may not be published, 
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