CREATE TABLE table_18666 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

how many district with incumbent being david delano glover
SELECT COUNT("District") FROM table_18666 WHERE "Incumbent" = 'David Delano Glover'
SELECT COUNT("District") FROM "table_18666" WHERE "Incumbent" = 'David Delano Glover'