Connecting to a secondary and querying the is_primary parameter returns True for a secondary

Evidence:

primary = <type 'tuple'>: (u'ussd-prd-mgdb03.', 27017)
client = MongoClient(host=['ussd-prd-mgdb01:27017'], document_class=dict, tz_aware=False, connect=True, replicaset='redacted')
is_primary = True