The answer is it's easy. Some DOs actually head the allopathic family residency programs in southern CA. I think the one at USC is headed by a DO and a few others. Look on Freida at all the CA residencies and you see that the residents are a good mix of MDs and DOs.
Also if you go to this site:
http://www.scutwork.com/other/match2004/Unfilled_Program.pdf
...it shows all the unfilled programs from last year in all specialties and in all states. If you look at page 3 it shows the allopathic family practice residency programs in CA that didn't fill. I copied and it pasted below. The 1st of the last two numbers indicates the program's quota and the last number indicates how many spots were taken. For example, for the 1st choice at California Hospital medical center, they had 8 open spots and filled 4.
CALIFORNIA
CALIFORNIA HOSP MED CTR
Tel: (213)744-0801 8 4
Email:
[email protected]
Fax
213)741-1434
KAISER PERMANENTE-LA-CA
Tel: (323)783-4516 2055120C0 9 8
Fax
323)783-4771
MERCY MED CTR-REDDING-CA
Tel: (530)225-6090 3081120C0 7 4
RIVERSIDE COUNTY REG MED-CA
Tel: (909)486-5611 1850120C0 9 8
UC DAVIS MED CTR-SAC-CA
Tel: (916)734-3432 1046120C0 9 5
Email:
[email protected]
UC IRVINE MED CTR-CA
Tel: (714)456-6502 1043120C0 10 7
Email:
[email protected]
USC FAM MED RES PROG-CA
Tel: Not provided 1460120C0 3 2
UCI, USC, and Kaiser Permanente didn't fill their programs so you know they would have gladly taken a DO to fill their quota if they could. That basically means that FP is easy to get into in CA simply if you pass classes and boards. It's beautiful.