Why did the 9/11 Commission ignore the Tenet-Rice meeting?

So, it appears that the 9/11 Commission did know about the July 2001 meeting between Tenet, Rice and Black, where Tenet laid out the al Qaeda threat and Rice ignored it. Even Richard Ben-Veniste (one of the Dems on the Committee) was briefed on it by Tenet. As Ben-Veniste said, when he was still saying he didn't know about the meeting, “This is certainly something we would have wanted to know about." Now, he says he did know about the meeting but won't say why the report ignored it.

TPM Muckraker asks the obvious question, "why did the Commission ignore this in their report?" Frankly, it doesn't seem to me there are any exculpatory answers, and most of the most probable answers seem to me to be pretty incriminating, given that there were a number of Democrats on the Committee who would have had to cooperate in the deep sixing of this. Does the word "conspiracy" come to anyone's mind?