Perhaps because the voters aren't stupid and they know that Billbray couldn't care less about immigration or any other issue, so long as he gets elected. If he thought full amnesty was a popular position he was gladly champion in it.
His opponent is claiming to be against amnesty but for Mcains comprehensive bill..the ads are over the line, Bilbray is getting reamed as a lobbyist who missed votes on immigration when he was a rep before...Busby is doing a Bush on amnesty..lol...lots of money being spent here...the lobbyist thing is hurting Bilbray people are tired of paid reps...and I think they see him as just another pea in the pod...