<?php
//$connect_error = 'Sorry, we\'re experiencing connection problem.  Please try again later...  Thank you!';
//mysql_connect('localhost','root','aee1024') or die ($connect_error);
//mysql_select_db('db_vts') or die($connect_error);
//error_reporting(1);
$servername = "localhost";
$username = "root";
$password = "aee1024";
$dbname = "db_vts";
// Create connection
$mysqli = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
} 

  $ID = $_POST['ID'];
  $results = $mysqli->query("SELECT * FROM PresidentialCandidate WHERE  ID='$ID'");   
  if( $results->num_rows > 0 )
  {
   $row = mysqli_fetch_array($results,MYSQLI_ASSOC);

    //Instead of just echoing out the ID, you need to build the result/data that you want in the div right here. The success function of the AJAX call will append whatever you echo out here
    echo $row['ID'];
  }
?>