I think it all really depends on what you have evidence they said, saw and knew.

Yeah, I agree it will be impossible to convict a congressional rep for voting against certification. BUT if you have evidence that person was attending meetings where a criminal conspiracy was taking place and especially if you have evidence they were directed to stall, and especially if they knew what was to happen after the vote failed… Then idk maybe they can be charged as part of a conspiracy. But just voting NO on it? I don’t think that’s criminal in and of itself.