CREATE TABLE table_718 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What year was ike skelton first elected?
SELECT MIN("First elected") FROM table_718 WHERE "Incumbent" = 'Ike Skelton'
SELECT MIN("First elected") FROM "table_718" WHERE "Incumbent" = 'Ike Skelton'