CREATE TABLE table_18577 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

What was the result of the election featuring r. ewing thomason (d) unopposed?
SELECT "Result" FROM table_18577 WHERE "Candidates" = 'R. Ewing Thomason (D) Unopposed'
SELECT "Result" FROM "table_18577" WHERE "Candidates" = 'R. Ewing Thomason (D) Unopposed'