The AP has not always been the end all be all for NC's so to only include them is pretty biased. To say the PAC-10 only has (4) NC's is ridiculous, especially when USC alone has 9 and is only behind Notre Dame and Alabama. Even if you went by AP national championships at least get your facts right, USC has 5.
Editor's Note: This issue has been raised and answered before at How Many NCS Does USC Really Have.