A judge locked away evidence of fraud one month after the election, preventing investigators from examining the evidence. An eyewitness testifies under oath six months later to having seen reams of fake ballots, so the judge unlocked the sealed evidence, but did not allow "outside" investigators to examine the evidence. After friendly or "insider" officials examined the evidence and as well, and after other courts had rejected voting fraud cases on the nonsensical claim that "outsiders" have no standing to bring voter fraud cases to court, the judge threw out the case without having ever allowed "outside" (i.e. Trump-supporting) investigators to examine the evidence.
Democrats cannot claim the handling of the evidence was non-biased and thorough. In fact, the whole case was corruptly handled from start to finish.