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Legal experts gauge future for Supreme Court nominee John Roberts

As Senate lawmakers prepare to hear from Supreme Court nominee John Roberts, observers are combing his legal background to see how he might rule from the high court. How important is Roberts' dissent in a decision about the Endangered Species Act? What are his views regarding the U.S. Constitution's commerce clause, the backbone of federal environmental laws? And will Roberts' confirmation result in more business cases on the docket? Mark Levy, an attorney at Kilpatrick Stockton who has argued extensively before the Supreme Court, and Glenn Lammi, chief counsel of the legal studies division at the Washington Legal Foundation, explain their thoughts on President Bush's nominee.