Purpose: Get the tracking results by state for a particular mailing.
        Example URL:
        https://MrMailTracker.com/api/track_mailing_state?login_id=49&user_id=20&key=GsF6CkPmErRh&mailing_id=55382
    
Sample response:
[
    {
        "lat": "32.8067",
        "delivered": 31,
        "lng": "-86.7911",
        "mailed": 31,
        "title": "Alabama"
    }, {
        "lat": "39.0598",
        "delivered": 20,
        "lng": "-105.3111",
        "mailed": 21,
        "title": "Colorado"
    }, {
        "lat": "47.4009",
        "delivered": 19,
        "lng": "-121.4905",
        "mailed": 19,
        "title": "Washington"
    }, {
        "lat": "27.7663",
        "delivered": 28,
        "lng": "-81.6868",
        "mailed": 28,
        "title": "Florida"
    }
]