In his recent testimony before the House of Representatives, James Comey presented himself as being something like a sleepwalker—he remembers nothing, knows nothing, and cannot even speculate on things he was involved in, much less ones that involved others in the agency he headed.
I think I can use this image without being called a racist, because Comey is white as the driven snow:
Comey doesn’t mind looking like a fool as long as he doesn’t implicate himself as a knave. He also knows that those who support him will see his tactic as a smart one—as any lawyer is aware, if a witness says he or she doesn’t know something it’s awfully hard to cite that person for perjury.
If you want to learn more about the details of what Comey professes not to know, please see this, this, and this. From the latter:
Somehow Comey managed not to know anything about the FBI’s most important case from the summer of 2016. He said that he hadn’t troubled himself to read the originating documents for Crossfire Hurricane and couldn’t be bothered to find out the agency’s claimed “predicate” for it.
As for the FBI’s most important “source” for Crossfire Hurricane, Christopher Steele, he showed no curiosity about him either, though Comey’s lawyer obviously coached him enough to repeat the sanitizing fable that Steele’s dirt-digging continued earlier work by Fusion GPS for Republicans. Comey claimed not to know that Hillary’s law firm paid Fusion GPS, but confidently stated that Republican money launched the “dossier” project, which is a falsehood. The Steele project was separate from Fusion GPS’s work for anti-Trump Republicans during the primaries.
How did Steele’s dossier get to the FBI? Comey plumb didn’t know! Did the FBI confirm his information? Comey couldn’t remember. Had he studied, before signing, the Carter Page warrant application that gave the FBI the power to rifle through Page’s life, both past and present? Nope; Comey didn’t think that necessary, though he did hear from someone that Page was supposedly working for the Russian government. Did he know that Steele had been dropped by the FBI for disseminating his paid opposition research on Trump to anti-Trump reporters? No, Comey didn’t, and wasn’t sure to this day if that had happened.
There’s so much more going on with all the anti-Trump investigations that to cover them all would take a full day of writing. So I’ll just give you some links. I warn you that they make for depressing reading, because just as it doesn’t seem that Comey will experience any consequences for his actions, it also seems as though these conspiracies may indeed bear just the fruit their planners intended: see this, this, and this.

