In theory, BHO should have had 5 drivers licenses: HI, CA, IL, NY, MA -- all the states he lived in. I think that HI and CA are surer bets since we now know of the Illinois licence number. The chances are fair that his legal name was Barry Soetoro or Barry Obama in California at least:
A consideration: some of those states may also require a COLB to establish the driver's license. IF any of the states retained a copy of the COLB Long Form in their records BEFORE November 2001, when Hawaii began using the CertifcaTION of Live Birth, a FOIA request might shake a copy of BHO's Long Form loose...