Couric was hoping Palin would reply: “Well I just finished the Turner Diaries and am now beginning to real all of the Uncle Fester manuals...”
It's used as a trip-up question in this case.
IMHO
Palin is given many news clips to read a day. She probably don’t know exactly the source of every single one, so she said what she said, all and everything. Which to Couric, means she doesn’t read as she couldn’t answer specifically