There were several conservatives running. but they all split the vote to enable Bilbray to make the run-off with 15% of the vote.
There was a third party type. Both he and Bilbray pretty much used illegal immigration as their core issues and even that turned into kind of a food fight. The minutemen, and some of Tancredo's followers, ended up endorsing the third party opponent because they didn't think Bilbray was strong enough on immigration.