"Doesn't Filner represent Chula Vista a northern TJ suburb?"
Yes, Filner represents Chula Vista, the "Pride of the South Bay". But as long as we have our version of the "Berlin Wall" we're still soildly in the United States. Check out the map of his district. It's no wonder he keeps getting reelected.
http://www.house.gov/filner/images/CA51largemap.jpg
Was that picture taken from the US side? The next time that I am down in San Diego I must go and actually see the wall.