From Andrew Sullivan’s Daily Dish, but by Excitable Andy’s assistant:
The easiest way to disprove these conspiracy theories is to consider what would be required for them to be true. Palin’s doctor, along with a good number of Mat-Su Regional’s doctors, nurses, and administrators would need to be in on the cover-up. On multiple occasions Palin would have had to pad her belly to make herself look pregnant. She would have needed to get friends to lie about seeing her breast feed. She would have had to silence an entire community – including two 17-year-olds and their friends – while the national media and the National Enquirer snooped around. Implausible to say the least.