Sen. John McCain, R-AZ, left, greets Sen. Barack Obama, D-IL, before Obama's testimony at a hearing entitled "Senators' Perspectives on Global Warming," held by the Senate Committee on Environment and Public Works, on Capitol Hill in Washington, D.C., Tuesday, January 30, 2007. (CHUCK KENNEDY/MCT)
Sen. John McCain, R-AZ, left, greets Sen. Barack Obama, D-IL, before Obama's testimony at a hearing entitled "Senators' Perspectives on Global Warming," held by the Senate Committee on Environment and Public Works, on Capitol Hill in Washington, D.C., Tuesday, January 30, 2007. (CHUCK KENNEDY/MCT)
Sen. John McCain, R-AZ, left, greets Sen. Barack Obama, D-IL, before Obama's testimony at a hearing entitled "Senators' Perspectives on Global Warming," held by the Senate Committee on Environment and Public Works, on Capitol Hill in Washington, D.C., Tuesday, January 30, 2007. (CHUCK KENNEDY/MCT)

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