CREATE TABLE table_28912 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Who is first elected when Kentucky 6 is the district?
SELECT "First elected" FROM table_28912 WHERE "District" = 'Kentucky 6'
SELECT "First elected" FROM "table_28912" WHERE "District" = 'Kentucky 6'