CREATE TABLE table_759 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What year was first elected william m. wheeler (d) unopposed?
SELECT "First elected" FROM table_759 WHERE "Candidates" = 'William M. Wheeler (D) Unopposed'
SELECT "First elected" FROM "table_759" WHERE "Candidates" = 'William M. Wheeler (D) Unopposed'