She's Bush's Filter basically. We all know his news is dumbed down and spun, apparently Miers is the one who does it.
http://www.smu.edu/smunews/harrietmiers/miers-smumagazine-text.htm<snip>
Miers labors behind the scenes in a West Wing office, every surface piled high with folders and documents. Yet as the gatekeeper for presidential paperwork, she is an assistant to the President and, therefore, a senior staff member and adviser to him.
“This is certainly not a job that I was aware existed before it was offered to me,” Miers says. “The position was created to make sure of two things: first, that documents going to the President are appropriately screened and prepared in the right form, and also that the President receives the benefit of the advice of all appropriate senior staff with regard to the issues being presented to him. The President is entitled to know when his advisers agree on an issue, when they disagree, and what their disagreements are.”
To keep the information flowing, Miers and her staff work in shifts beginning early and ending late. It is not uncommon for a staff member to arrive at 5:30 a.m. to handle paperwork that has come in during the evening or to prepare for early morning events. Miers’ office also is responsible for ensuring that the President receives his nightly briefing book. Throughout the day, Miers talks frequently with other members of the President’s staff to discuss the documents that pertain to issues in their areas of expertise. She often travels with the President to continue processing the necessary documents and to ensure that the briefing book for each day is properly prepared.