Writing your first Django app tutorial, part 3 question

I try the "Writing your first Django app tutorial, part 3" (http://
docs.djangoproject.com/en/dev/intro/tutorial03/#intro-tutorial03) with
Django-1.2.1.
I have got a Page not found (404) when modifying the urls.py described
in the "Decoupling the URLconfs" section:
Request Method: GET
Request URL: http://127.0.0.1:8000/polls/results

mysite/urls.py is:
from django.conf.urls.defaults import *

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
(r'^polls/', include('mysite.polls.urls')),
(r'^admin/', include(admin.site.urls)),
)

mysite/polls/urls.py is:
from django.conf.urls.defaults import *

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('mysite.polls.views',
(r'^$', 'index'),
(r'^(?P<poll_id>\d+)/$', 'detail'),
(r'^(?P<poll_id>\d+)/results/$', 'results'),
(r'^(?P<poll_id>\d+)/vote/$', 'vote'),
)

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