CREATE TABLE table_18349 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

Name the candidates for texas 20
SELECT "Candidates" FROM table_18349 WHERE "District" = 'Texas 20'
SELECT "Candidates" FROM "table_18349" WHERE "District" = 'Texas 20'