CREATE TABLE table_28872 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" TEXT, "Result" TEXT, "Candidates" TEXT)

Who was the ran as an incumbent leader first in 1818?
SELECT "Incumbent" FROM table_28872 WHERE "First elected" = '1818'
SELECT "Incumbent" FROM "table_28872" WHERE "First elected" = '1818'