CREATE TABLE table_3615 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" CLOB, "Result" CLOB, "Candidates" CLOB)

Name the incumbent for lost re-election democratic-republican hold
SELECT "Incumbent" FROM table_3615 WHERE "Result" = 'Lost re-election Democratic-Republican hold'
SELECT "Incumbent" FROM "table_3615" WHERE "Result" = 'Lost re-election Democratic-Republican hold'