Ok Im not necessarily accusing Bob Kirkland of being Red John, but unless the writers actually believe Red John has powers(which ruins the charm of the show), he is the only one who could access what Jane was doing in his room(other than Patrick ofc), even though Jane might have tricked him (the toothpick thing). 

Now it could also be Haffner, Visualize has powers and insight into a lot of organizations, why not the CBI? He couldve also accessed what PJ was doing. Similalry it could be Stiles. 

But neither of them could access Patricks brain( though idk cause Stiles does seem to have powers) and pull out his childhood memory. So again pointing towards PJ. The only reason Im not accusing PJ is I wont be able to stand it if he is RJ. But all the clues point towards him.

Now on the others on the list
Partridge - creep, works for the CBI, but then why would he need a mole within the CBI?
I couldnt even remember who the sheriff was so it would be extremely disappointing if Heller has him as RJ and most of the audience cant even relate.

Now Bertram is interesting. maybe Lisbon is one of his accomplices and is smarter than we all think? Maybe she is feeding him with info.

Finally Reede Smith has appeared on one episode(like the sheriff). again highly unlikely only clue is when he actively participates in the red pearl job the patrick pulls