I think Gale Bertram is the most likely suspect. I think several of his actions since being introduced on the show demonstrate the narcissism that Red John is famous for.

1. Patrick Jane was *literally* sitting with Red John at the mall, prior to the fake Red John showing up.
2. Gale Bertram says to Patrick, "when you catch Red John, I'll be there"
3. Gale Bertram says, "I know that sometimes I must appear calculating, even duplicitous to you, but please understand it comes with the job description. I am many things to many people."
4. Gale Bertram quotes William Blake (not the same poem as The Tiger, and not under RJ circumstance)
5. Gale Bertram is constantly involved with the media. Whether he's talking to the press on behalf of the CBI, reading the newspaper (a scene we have seen often), or discussing the media with team, he is always seemingly conscious of it. This ties directly in to Red John saying, in the first episode, "I do not like being slandered in the media"