Again PJ1120, if you do a search on SDN (pre-DO forum), you will see this topic discussed ad nauseum.
In short, there is no ranking
Some DO schools are ranked by USNews for primary care ranking. However, before you decide to throw the full weight behind this, look at what factors USNews used in determining rank.
As a guide to help you, here is how you do a search on SDN
first, sign in/log in
There should be a a long box titled "Student Doctor Network Forums" in bold. Underneath are a set of menus. User CP, FAQ, Members List, Calender, New Posts, Search, Quick Links, Log Out.
Click on "Search"
Now you can either
1. Type in your search words and it will search all forums
OR
2. Click on advance search - here you can search specific forums, search by members, restrict searches to certain dates, etc.