Apparently the current svn sources of googlecl work with more recent versions of Python gdata.
Didn't for me.
I installed an earlier gdata thusly:
sudo pip install http://gdata-python-client.googlecode.com/files/gdata-2.0.14...
I installed an earlier gdata thusly:
sudo pip install http://gdata-python-client.googlecode.com/files/gdata-2.0.14...
[1] http://code.google.com/p/googlecl/issues/detail?id=468