CREATE TABLE table_2668374_18 (incumbent VARCHAR, party VARCHAR, first_elected VARCHAR)

What incumbent was a federalist that was first elected in 1803?
SELECT incumbent FROM table_2668374_18 WHERE party = "Federalist" AND first_elected = "1803"
SELECT "incumbent" FROM "table_2668374_18" WHERE "1803" = "first_elected" AND "Federalist" = "party"