If you open up your /my documents/my games/polmachine2008/candidates folder, you willl see all the candidates you have created.
You can either delete your sarahpalin.candidatexml file, or:
Rename the file to MySarahPalin.candidatexml, and open it in NotePad
Near the top, you should see a line like this:
<Candidate InternalName="SarahPalin" Custom="true">
Change this to
<Candidate InternalName="MySarahPalin" Custom="true">
Then find the line for Last Name:
<LastName>Palin</LastName>
and change it to
<LastName>Palin 2</LastName>
Save the file and start up the game, and you should now be able to see both.
