Is it possible that their bias is the result of wishful thinking rather than willful manipulation? Or maybe they just tweak the parameters until they get the result that they "know" must be true?
Oh it gets better. On the morning the poll was released, the AP changed to title of their article to hide the positive Bush news.
http://www.freerepublic.com/focus/f-news/1703043/posts
The original title was "GOP Gains Ground In Battle For Congress" and a few hours later it miraculously became "Poll Shows GOP Not Making Its Case"
AP - scumbags