WASHINGTON (Reuters) - Republican Senator John McCain said on Tuesday night he believed an overhaul of the U.S. healthcare system was possible this year after President Barack Obama called for such a timetable. In his speech to a joint session of the U.S. Congress, Obama said that due to rising costs, revamping the healthcare system "must not wait, and it will not wait another year." McCain, who is a member of the Senate Committee on Health, Education, Labor and Pensions, said in an interview after the speech that he felt an accord was reachable this year. "I do think it's...