NEW : Sen. Kennedy returns to Medicare on two months ago . NEW : In a written statement , Kennedy said , `` I return to the Senate today to keep a promise to our senior citizens -- and that 's to protect Medicare . Kennedy 's vote helps to break GOP filibuster of GOP bill . He was diagnosed with a cancerous brain tumor Wednesday .
NEW : Sen. Kennedy returns to Medicare on two months ago . NEW : Kennedy 's vote helps to break GOP filibuster of GOP bill . He was diagnosed with a cancerous brain tumor Wednesday .