If you look at the admissions web pages for a lot of the schools you will see that although not required, letters from osteopathic physicians are highly preferred. I believe NOVA (maybe others) actually requires a DO letter. I'm sure there are others.
Don't let stats like that let you feel like you are a shoe-in. Even though that might be true, keep pushing on and make you apps as good as possible! It will be worth it when it is all over. Not too hard to get in there and shadow, though. Awesome stats, good luck!
Just go shadow a DO over the Christmas break, and then get a letter. It's not that difficult. Contact your local state osteopathic association or nearest osteopathic medical school for willing participants.
Check each school's admissions webpage to see if it is just suggested or if it is actually required. I know Pikeville not only requires D.O. letter, but that D.O. has to be a member of the AOA!
That being said, while a D.O. letter is preferred, every admissions counselor I have spoken to says that a letter from a M.D. who knows you and can attest to your interest in holistic medical practice is better than a letter from a D.O. who does not know you very well.
If you live in a big city or near hospitals where DO students do their rotations it should not be an impossible task if you try at it for a bit. A good number of people are getting DOs from just 1-2 shadowing sessions so I think it is worth the effort.
I did not have a letter from a DO. About half the DO schools require one - the rest only "recommend" one. I found out which ones didn't require one by going to their website and actually reading each school's requirements.
I was accepted into a number of schools that required a letter from a DO only, and I only had a MD letter. I explained to them of my situation (my MD letter was from someone who really knew me and could tell them of my desire of becomming a physician) and for the most part, they accepted the MD letter just fine. I would call first to make sure though. FYI, OSU told me hell no, but oh well . Good luck.