Politician Medical Watch: California Congressman Robert Matsui has died at age 63 of myelodysplastic syndrome. A disease which, contrary to CNN, isn't all that rare:

The actual incidence is unknown. MDS was first considered a separate disease in 1976, and occurrence was estimated at 1500 new cases every year......The perception that the incidence is increasing may be due to improvements in recognition and criteria for diagnosis. Statistics from 1999 show that 13,000 new cases occur per year (approximately 1000 cases each year in children), surpassing chronic lymphocytic leukemia as the most common form of leukemia in the Western Hemisphere.