為甚麼代表中央的曾蔭權，要封殺政治對手的挑戰與參與？

because you 'll never know who vote the cheif exe .

if there is another 政治對手 , no one can gaurantee whether the commitees will vote him or not . (you cannot find it out who vote the 政治對手.)

So, 中央 had to make sure Donald will 100% win .

你既問題應該問中央政府有絕對獨裁的有必要嗎？

特區政府有絕對獨裁的必要!