CREATE TABLE table_18394 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Who's the incumbent of the district with first election held in 1950?
SELECT "Incumbent" FROM table_18394 WHERE "First elected" = '1950'
SELECT "Incumbent" FROM "table_18394" WHERE "First elected" = '1950'