It is not treason to question the results of an election. It is not sedition to contest an election. If there is evidence that an election not handled correctly in a way that is sufficient to change the outcome, those with a stake in the outcome should not accept it.
This idea that it is a high crime to question an election is genuinely dangerous. And it is especially bad coming from democrats, because tactics like voter suppression disproportionately benefit republicans.
No one should accept an unrepresentative election.