Portland, Ore. -- Dr. Eugene Smathers, 60, pastor of a Presbyterian church in Big Lick, Tennessee, which has never had more than 75 members, scored a surprise upset when he was elected moderator of the 3.3 million-member United Presbyterian Church in the U.S.A. Dr. Smathers defeated Dr. William H. Hudnut Jr., of New York, who recently led the denomination's Fifty Million Fund to a successful conclusion. The new moderator suceeds Dr. Ganse Little, minister of the Pasadena, California Presbyterian church. Dr. Smathers said he hopes to "extend the strength and mission of the Church to the poor of the poor of the world."