CREATE TABLE table_18321 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Which district has candidates is dick gephardt (d) 81.9% lee buchschacher (r) 18.1%?
SELECT "District" FROM table_18321 WHERE "Candidates" = 'Dick Gephardt (D) 81.9% Lee Buchschacher (R) 18.1%'
SELECT "District" FROM "table_18321" WHERE "Candidates" = 'Dick Gephardt (D) 81.9% Lee Buchschacher (R) 18.1%'