Can't figure out how to pull variables out of json array

Can't figure out how to pull variables out of json array

I need to pull the variables out of my json array using a loop.  I just cannot figure out how to do it.  Here is my json: 
  1. [{"date":"Nov 02 2012 12:00:00:000AM","sum":-16481.039,"from":"Jack Leider","to":"Richard MacDonald"},{"date":"Nov 02 2012 12:00:00:000AM","sum":-4637.155,"from":"Jack Leider","to":"Richard MacDonald"},{"date":"Nov 02 2012 12:00:00:000AM","sum":85900,"from":"Jack Leider","to":"Richard MacDonald"}]
Here is the javascript I currently have:
  1. var json = jQuery.parseJSON(orders);
    for(order in json) {
      var date = order.date;
      var sum = order.sum;
      var to = order.to;
      var from = order.from;




  2. $('#ordersTable').append("<tr><td>" + date + "</td><td>CM</td><td>" + from + "</td><td>" + to + "</td><td>" + sum + "</td></tr>");

Can someone help me out with this?
Thanks
Mike