It's my understanding that at least two of the other three were strong secure-the-borders, anti-illegal immigration candidates. One was supported by the MinuteMen (Griffith), and I believe the other was an independent running on a border security platform, as well. I would anticipate that those who voted for those two border security candidates would vote for Bilbray in the general election in November.
Thanks for the info. It's solid in my mind that the Dems got stomped.