CREATE TABLE table_28883 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

What district(s) did henry clay represent?
SELECT "District" FROM table_28883 WHERE "Incumbent" = 'Henry Clay'
SELECT "District" FROM "table_28883" WHERE "Incumbent" = 'Henry Clay'