CREATE TABLE table_18719 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

Who was the incumbent in the election of henry garland dupr (d) unopposed?
SELECT "Incumbent" FROM table_18719 WHERE "Candidates" = 'Henry Garland Dupré (D) Unopposed'
SELECT "Incumbent" FROM "table_18719" WHERE "Candidates" = 'Henry Garland Dupré (D) Unopposed'