CREATE TABLE table_18320 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What was the incumbent for texas 19?
SELECT "Incumbent" FROM table_18320 WHERE "District" = 'Texas 19'
SELECT "Incumbent" FROM "table_18320" WHERE "District" = 'Texas 19'