CREATE TABLE table_18325 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many times was the candidates dick gephardt (d) 81.9% lee buchschacher (r) 18.1%?
SELECT COUNT("Incumbent") FROM table_18325 WHERE "Candidates" = 'Dick Gephardt (D) 81.9% Lee Buchschacher (R) 18.1%'
SELECT COUNT("Incumbent") FROM "table_18325" WHERE "Candidates" = 'Dick Gephardt (D) 81.9% Lee Buchschacher (R) 18.1%'