CREATE TABLE table_name_18 (republican_seat_plurality VARCHAR, state_ranked_in_partisan_order VARCHAR)

What is the Republican seat plurality of North Carolina?
SELECT republican_seat_plurality FROM table_name_18 WHERE state_ranked_in_partisan_order = "north carolina"
SELECT "republican_seat_plurality" FROM "table_name_18" WHERE "north carolina" = "state_ranked_in_partisan_order"