PORTLAND, Ore. -- As a 23-year-old Navy officer in 1945, Mark Hatfield was among the first American servicemen to see the destruction wrought upon Hiroshima by an atomic bomb.
It was an experience that helped shape him into an outspoken critic of war as he went on to become a two-term Republican Oregon governor and then the longest-serving U.S. senator in Oregon history.
He died Sunday night at a care center. He was 89.
He was elected governor of Oregon in 1958 and re-elected in 1962 before winning his first U.S. Senate campaign in 1966. He served five terms in the Senate, from 1967 to 1997.
Sen. Hatfield is best known at the national level for his pacifist ways, which often put him at odds with fellow Republicans but endeared him to many Oregonians.
At the 1965 National Governors Conference in Los Angeles, he was denounced as a traitor for casting the lone "no" vote among 50 governors on a resolution supporting President Lyndon B. Johnson's policy in Vietnam.
In the early 1970s, he joined Sen. George McGovern, D-S.D., to sponsor an amendment seeking to end the Vietnam War. A decade later, he helped launch a campaign for a nuclear weapons freeze.
He said his major accomplishments included ushering through Congress a ban on U.S. nuclear weapons testing in 1987.
He frequently spoke out for the sick, homeless and others in need of an advocate. At a congressional hearing in 1990, he pleaded for increased money for Alzheimer's research while describing how the disease had reduced his father, a powerfully built former blacksmith, to a "vegetable."