CREATE TABLE table_18622 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

what are all the district with incumbent being sam hobbs
SELECT "District" FROM table_18622 WHERE "Incumbent" = 'Sam Hobbs'
SELECT "District" FROM "table_18622" WHERE "Incumbent" = 'Sam Hobbs'