@layman,
Comey wanted to give the impression that he was impartial, so he wouldn't allow the tainted AG's office make the decision. Completely bogus. He was just as determined to exonerate her as they were--he just wanted to make sure it "looked" legit, that's all.
Same thing was going on when he sent his letter to congress in October. He wanted to preclude any later claim that information was "suppressed," if and when it came out that Strzok and McCabe had been sitting on the Weinstein emails for over a month, hoping to stall until after the election.
But, again, he was just trying to make sure her election appeared to be legitimate. He admitted that he wrote it only because he was sure Clinton would win anyway.
As for Trump, I think McCarthy puts it well:
Quote: FBI has conducted what is supposed to be a classified, counterintelligence probe of Russia’s interference in the 2016 election — not a public, government-orchestrated campaign of insinuation that Trump was complicit in Russian perfidy.
He was "playing politics" every inch of the way.