You can say Comey is not political. Which means that he was not for one candidate or the other. But when you ask if he was for the swamp and against the politicians, that is where Comey’s bias lies. Comey is pro swamp, pro CIA, pro FBI. And remember the swamp tends to vote democrat.
That seems like a reasonable characterization. My one enduring impression of Comey is that he’s a misfit and a moron. It would be kind of odd to accuse him of political bias when you have Hillary Clinton and many prominent Democrats still running around in 2018 blaming him for her loss in the 2016 election.