CREATE TABLE table_18435 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

How many candidates represent the district of kenneth a. roberts?
SELECT COUNT("Candidates") FROM table_18435 WHERE "Incumbent" = 'Kenneth A. Roberts'
SELECT COUNT("Candidates") FROM "table_18435" WHERE "Incumbent" = 'Kenneth A. Roberts'