Once she blew those initial interviews, the undecideds moved away from our ticket and went Obama
Sarah did better later, but the damage was done.
Anybody with an IQ higher than an eggplant would know that the press was gunning for her - if she couldn't handle Katie Couric, she couldn't handle the Presidency.
The best part of those interviews, especially the one with the Chipmunk from Hell, ended up on the cutting room floor. It was heavily edited to remove lucid responses. It was a hit job.