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Massachusetts Sen. Edward Kennedy, the brother of assassinated President John F. Kennedy and the elder statesman of American liberal politics, has a malignant brain tumor, his doctors said on Tuesday (May 20). Kennedy, 76, who has been hospitalized in Boston since he had a seizure on Saturday (May 17), will likely need chemotherapy and radiation therapy to treat the glioma, a type of tumor that usually kills within three years. A brief statement by Dr. Lee Schwamm of Massachusetts General Hospital and Dr. Larry Ronan, a primary physician there, did not give details on Kennedy's diagnosis or outlook and did not mention the possibility of surgically removing the tumor -- the best hope for longer survival. Other experts called the diagnosis a serious one and agreed the tumor would very likely kill Kennedy. His sons Patrick Kennedy, a member of congress, and Ted Kennedy Jr. were seen arriving at the hospital on Tuesday afternoon. Senator Barack Obama, Senator Hillary Clinton and Senator John McCain all expressed concern for their colleague's condition. Senator Barack Obama, who was endorsed by Kennedy in January said "we're all distressed in terms of what has happened, the diagnosis, but I do know that he is going to fight." "There isn't anybody like him. He gets up and goes out and does battle on behalf of all of us every single day. And I know he's a fighter when it comes to the challenges he's facing right now. There's never been anybody like him in the Senate. He's p...