CREATE TABLE table_18267 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who are all the candidates vying for Henry B. Gonzalez' seat?
SELECT "Candidates" FROM table_18267 WHERE "Incumbent" = 'Henry B. Gonzalez'
SELECT "Candidates" FROM "table_18267" WHERE "Incumbent" = 'Henry B. Gonzalez'