Not everyone in the Bush Administration is a political appointee. Only a minute number of them are. There is a huge percentage in the Administration who actively oppose it.
The enemy within.
Bush administration clearly briefed all the media involved, especially NYT and Wash Post. These guys had way too many details, which they got from off-the-record briefings from CIA/Homeland/FBI, etc.
I agree that Homeland had to raise the alert. But they gave out way too many details, which helped to cement their credibility. But the flipside, the cost of that is that many of the potential operations were comprimised.