Trying to use plugin to convert to JSON

It occured to me that what voter wanted wasn't a plainObject, but
something formatted in a very specific way. Specifically, I think I was
passing something that looked like:
{Thing1 : "Thing", Thing 2 : "Thing"}
when what it wanted was {"Thing1" : "Thing", "Thing 2" : "Thing"}
So I went looking for a plugin to make a plainObject look like JSON.
Found it here https://code.google.com/p/jquery-json/ and added it. But
when I implement it, voter returns:
<br />
<b>Notice</b>:  Undefined index: vote in
<b>C:\xampp\htdocs\shakespeare\voter.php</b> on line <b>22</b><br />
Vote failed. Malformed input:
So something is wrong. The weird thing is that if you use the
implementation I had in my last commit, voter doesn't return anything.
So I'm out of ideas for the time being.