Check out the percentage of Repub/Dem/Independent voters in those polls.
The goal is to lower the President's approval by saying that his numbers are 'plummeting.'
Six in ten voters support staying the course in Iraq. 90 percent, or nearly so, of Republicans still support him. Skew the percentages farther and farther toward the left, and you get the nosedive.
The MSM doesn't like to report that President Bush's base is strongly behind him. They like to prop up the likes of Hagel and congressmen most people have never heard of to imply that the Republicans are fracturing.
President Bush's approval numbers are lower because he has had to make tough decisions and tackle tough problems which is what he is supposed to do. It's easy to keep your approval numbers high if you only make popular decisions for the sole purpose of keeping them high, like Clinton did for eight years.
Perception is all. This is the lesson from Pravda, the Soviet news agency, that spouted propaganda continuously. Inculcation means repeat something enough and it will eventually be believed, true or not.
The Soviets undertood this very well, and so do the liberal media, who apparently perceive themselves as the modern incarnation of Pravda, and miss no opportunity to trumpet the ideals of communism.