This is complete speculation, but here it is: Olivia Taylor called her friend, Martin Collier, to help arrange a hit on Jonas Hodges. They discussed the idea of killing Hodges about 15 minutes into the episode. About a half-hour later, Hodges is killed by a car bomb at FBI HQ. We are supposed to think that Olivia's hitman did the job, despite the fact that 1) she never transferred the funds and 2) she called Martin beforehand and recanted the contract! I know it's "24" but... it's "24" which means something sinister is in the works. Someone else was tipped off to Hodges' status (the cabal... or maybe someone who just hated what Hodges did to this country). The car bomb was set via advance intel. So, that means there must be one last mole in the mix.
That mole can either be at FBI HQ or in the White House- take your pick. I ask you all to speculate who the last traitor will be.
Subtopic: Does the mole know of Olivia's attempt to hire the hitman? And if so, will he/she try to reveal Olivia's abandoned plans (and embarrass the President at the same time)?
Sub-subtopic: Aaron Pierce has been around a lot lately. Perish the tought, I know. But still...