CREATE TABLE table_37700 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB)

Who was the first person elected from Democratic GAIN?
SELECT "First elected" FROM table_37700 WHERE "Result" = 'democratic gain'
SELECT "First elected" FROM "table_37700" WHERE "Result" = 'democratic gain'