We already knew this

Tom Ridge: I Was Pressured To Raise Terror Alert To Help Bush Win

Ridge was never invited to sit in on National Security Council meetings; was "blindsided" by the FBI in morning Oval Office meetings because the agency withheld critical information from him; found his urgings to block Michael Brown from being named head of the emergency agency blamed for the Hurricane Katrina disaster ignored; and was pushed to raise the security alert on the eve of President Bush's re-election, something he saw as politically motivated and worth resigning over.

Manipulation? Who didn't think this was happening?