get_job_config fails when authentication required

When I try to call get_job_config against an Jenkins instance that requires authentication I get the following stacktrace:

Traceback (most recent call last):
  File "./test.py", line 13, in <module>
    print l_jenkins.get_job_config("test_git")
  File "/home/jamespage/src/oneiric/python-jenkins/upstream/python-jenkins/jenkins/__init__.py", line 289, in get_job_config
    return urllib2.urlopen(get_config_url).read()
  File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 400, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 513, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 438, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 372, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 521, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
urllib2.HTTPError: HTTP Error 403: Forbidden

Call needs to be wrapped in jenkins_open to ensure that username/password is passed in the request.