I think you will find that the Software Manager depends on the default Python being a specific version. On Mint 13 (Maya), it seems to need python 2.7.3 - I set the default as python 3.2.3 and all kinds of stuff stopped working ... Software Manager included. Set it back to the previous version, 2.7.3 and it's all happy again...
The following lines will 1. remove the existing link for python, then 2. create a new link pointing to version 2.7
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sudo rm /usr/bin/python
sudo ln -s /usr/bin/python2.7 /usr/bin/python
Note : these are the lines I used on my system (Mint 13 Maya); yours MAY be different!!!