What are the obesity rates by state?

Here is a start.

State-Specific Prevalence of Obesity Among Adults --- United States, 2005

The two web sites that often have both national and state by state statistics on death and disease (obesity is considered a form of "morbidity," or disease) are the federal CDC (Centers for Disease Control and Prevention) and the National Center for Health Statistics (which is connected to the CDC).

For example: N C H S - FASTATS - Deaths/Mortality

I usually just go straight to CDC's home page and search for what I'm looking for.

Good luck!