CREATE TABLE table_18546 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many people on this list are named thomas abernethy?
SELECT COUNT("Candidates") FROM table_18546 WHERE "Incumbent" = 'Thomas Abernethy'
SELECT COUNT("Candidates") FROM "table_18546" WHERE "Incumbent" = 'Thomas Abernethy'