Vital records only preserve activity associated with actual vital events, in my understanding. The HI marriage vital record index that DOH released with Obama Sr. and Dunham as the groom and bride would only be for the vital event of a legally completed marriage, not just an application. That record was stated to be a marriage record by DOH.
FYI marriage licenses are issued by the Hawaii Department of Health so they will have both them and marriage certificates on file.
http://hawaii.gov/health/vital-records/vital-records/marriage/index.html