CREATE TABLE table_18256 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

how many district with incumbent being lindy boggs
SELECT COUNT("District") FROM table_18256 WHERE "Incumbent" = 'Lindy Boggs'
SELECT COUNT("District") FROM "table_18256" WHERE "Incumbent" = 'Lindy Boggs'