I have passed some JSON to my page via a webservice. I used JSON.NET to convert XML to JSON. The JSON output looks ok to me, but I am unable to access some of the items in the response. I am not sure why it is not working. I am using jQuery to read the response and make the webservice call. Even when I try to read the length of the array it says 'undefined'

function GetFeed(){

        document.getElementById("marq").innerHTML = '';

        $.ajax({
            type: "POST",
            url: "ticker.asmx/GetStockTicker",
            data: "{}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(response) {                  

            var obj = (typeof response.d) == 'string' ? eval('(' + response.d + ')') : response.d;

            for (var i = 0; i < obj.length; i++) {
                $('#marq').html(obj[i].person);
            }               

            }
        });

    }

This is a copy and paste of my response as it appeared in firebug:

{"d":"{\"?xml\":{\"@version\":\"1.0\",\"@standalone\":\"no\"},\"root\":{\"person\":[{\"@id\":\"1\",\"name\":\"Alan\",\"url\":\"http://www.google.com\"},{\"@id\":\"2\",\"name\":\"Louis\",\"url\":\"http://www.yahoo.com\"}]}}"}