I have no clue about the job market in Denver. However, I feel that it should be much more urbanized than the town you are from in WY. But as far as experience is concerned, you have 1.5yrs RN experience. That's more than enough to get a position on a med-surg floor or even mother/baby or labor and delivery. I would still apply for new grad positions but IMO one should never limit themselves to ANY opportunity. However, technically you are no longer considered a new grad because of your experience at the RN level. Do not let the fact that your experience is not "clinically based" deter you either. You have patient care experience REGARDLESS.
I also graduated in May 2010. But never found a job until March of 2011. After only 7months of experience in, my Chest Pain Unit is closing. They decided they are moving the beds for more med/surg floors space. Instead of merging with the med/surg staff, the ICU manager wanted to take a look at me. She recognized that I worked for 5yrs in an ICU as a clerk. She was willing to give me orientation of one month and half. If more is needed, than I will have that option as well. So starting next week, I am an ICU nurse.
In closing, apply, apply, apply and when you bag an interview, walk in there with the most confident attitude. If they try to question you as being limited in experience, then you sell yourself. Four years with a practice suggests longevity with a company and invested passion for OBGYN care. If a manager/interviewer doesn't recognize that, then you probably wouldn't want to work for them anyway. Good luck in your search!