CREATE TABLE table_18582 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

what's the first elected with incumbent being clair engle
SELECT "First elected" FROM table_18582 WHERE "Incumbent" = 'Clair Engle'
SELECT "First elected" FROM "table_18582" WHERE "Incumbent" = 'Clair Engle'