Do you really think that Comey has some secret evidence that Clinton has committed a crime, while simultaneously saying she shouldn't be prosecuted for anything, while simultaneously telling his own employees that he hasn't even read the latest emails, while simultaneously using rhetoric that hurts her as much as possible without actually accusing her of anything?
We can speculate on Comey's motives, but one thing is for certain: Comey doesn't have evidence of anything.
I don't know what to think besides that Clinton is innocent until proven guilty. I am ignorant of what is going on within the FBI but I find it highly unlikely based on what I have read and understand about Comey to believe that he is a huge Trump supporter, trying to tip the election in his favor.