Witness what happened to Dan Quayle when he was announced as George H. Bush's running mate. The media had to destroy him. He was a Reagan conservative, good-looking and young and he and his wife made a striking pair. He had to be undermined and eliminated as a future "threat."
The left is really frustrated by Sarah's resilience. The more they stomp on her the stronger she gets. The left has done a pretty thorough job of trying to knock her off, but she keeps bouncing back. As it is right now, all of her "warts" are out in the open and a good number of people are still able to see past the crap the left is spewing out.
The left's obsession is to destroy her in the eyes of the American people. So far they have been unable to do so. Now all they can do is sputter.