New accusations have emerged during the appeal of the bribery conviction of former Gov. Don Siegelman of Alabama that could buttress Democrats’ claims that the case against him was politically tainted, even as he prepares to argue against his conviction in a federal appeals court in Atlanta early next month.

The accusations, from a Justice Department employee, suggest that the Republican United States attorney whose office prosecuted Mr. Siegelman remained substantially involved in the case, long after she insisted that she had removed herself from it because of her partisan connections.

And the formal complaints by the employee, a legal aide in the office of the United States attorney in Montgomery, Ala., have brought to light an episode in the 2006 bribery and corruption trial that Mr. Siegelman’s lawyers now say could have led to a key juror’s removal: flirtatious messages sent by jurors to the prosecution about the marital status of an F.B.I. agent who was working with prosecutors. Other jurors have said that they felt pressured by the judge to reach a decision in order to go home and that some jury members read about the case on the Internet during the trial.

Mr. Siegelman was convicted and sentenced to seven years in prison in June 2007. In March, he was ordered freed on bond after nine months in a federal penitentiary by the United States Court of Appeals for the 11th Circuit, which cited “substantial questions” raised in his appeal.