Table: us_house_2006_elections
Columns: district
incumbent
party
first_elected
results

Question: What is the latest year for first elected with john hostettler as incumbent and a result of lost re-election democratic gain?
SQL: SELECT MAX("first_elected") FROM us_house_2006_elections WHERE "results" = 'lost re-election democratic gain' AND "incumbent" = 'john hostettler'