python 2.5 does not include json so lets try to use simplejson

bin/ansible

@@ -17,9 +17,13 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
+try:
+    import json
+except ImportError:
+    import simplejson as json
+
 from optparse import OptionParser
 import sys
-import json
 import os
 import getpass
 import shlex

lib/ansible/runner.py

@@ -16,11 +16,15 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+try:
+    import json
+except ImportError:
+    import simplejson as json
+
 import fnmatch
 import multiprocessing
 import signal
 import os
-import json
 import traceback
 import paramiko # non-core dependency
 import ansible.constants as C