Source JSON data is:
[ {\"name\":\"Alabama\",\"code\":\"AL\"}, {\"name\":\"Alaska\",\"code\":\"AK\"}, {\"name\":\"American Samoa\",\"code\":\"AS\"},
You could modify you model to look like this:
$scope.options = { "AL" : "Alabama", "AK" : "Alaska", "AS" : "American Samoa" };
Then use