CREATE TABLE table_3629 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

What is the district with the candidates edwin gray (dr)?
SELECT "District" FROM table_3629 WHERE "Candidates" = 'Edwin Gray (DR)'
SELECT "District" FROM "table_3629" WHERE "Candidates" = 'Edwin Gray (DR)'