CREATE TABLE table_18266 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

How many districts have Mac Sweeney as incumbent?
SELECT COUNT("Candidates") FROM table_18266 WHERE "Incumbent" = 'Mac Sweeney'
SELECT COUNT("Candidates") FROM "table_18266" WHERE "Incumbent" = 'Mac Sweeney'