CREATE TABLE table_3623 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

When was someone first elected in the district with incumbent john smith?
SELECT "First elected" FROM table_3623 WHERE "Incumbent" = 'John Smith'
SELECT "First elected" FROM "table_3623" WHERE "Incumbent" = 'John Smith'