My analysis of the 30 suspects:
Bret Stiles - friend of Jane, therefore no
Don Henderson - too limited a "network"
Dean Harken - possibility but work with virus' probably means no
Asher Maclean - no
Gale - i doubt its someone within CBI
Doc Dugan - no
Judge Manchester - has network, fits other explanations, and "is ma-"
Paul Fricke - possibly with the sexual language used about Red John's fascination with Jane, but likely no
Glen Snow - we know RJ is Caucasian.
Donny Culpeper - that "arc" resolved

Out of set 1: Manchester

Markham Shankar - not Caucasian, but "ma-" and fascination with death stuff makes him intriguing
Mancini - a possibility
Kirkland - up to no good, but a red herring i think
Max Winter - possibility with network to back him up
McAlister - not a large enough network
mashburn - possibly
volker - no
partridge - possibly
Jason cooper - possibly but the "failed coup" doesn't seem very RJ-like
Ellis Mars - interesting option but doubtful


Group 2: Mancini, mashburn, patridge

Dr. Linus - possibly but doubtful
haffner - a red herring but related to Visualize?
Bunting - computer skills but not much else to connect
Royston daniel - possibly, computer skills, network might be there, roy is a bit obvious though
reede- unlikely
JJ Laroche - not on the list
Minelli - someone more calcuating
molinari - eh
Ardiles - not white
baihach - interesting possibility

Set 3:Haibach, Daniel

So here are 6 candidates: Haibach, Daniel, mancini, mashburn, partridge, manchester

Mashburn has potential but I'll say Manchester has the better odds with his connections. If its Mashburn the sexual stuff between RJ and Jane makes more sense as a way to get to Lisbon.