Non-rhetorical question: did the change in the ruling party in the US (in early 2001) come between the original case and the dropping of the claim? I'm wonderi

Non-rhetorical question: did the change in the ruling party in the US (in early 2001) come between the original case and the dropping of the claim? I'm wondering whether the cause was more "a new head of the relevant department had a different attitude towards antitrust enforcement" (or possibly even "a different attitude towards Microsoft") than "the prosecution realized how shaky the argumentation had been".