“The fourth rule is: Make the enemy live up to their own book of rules. You can kill them with this, for they can no more obey their own rules than the Christian church can live up to Christianity.” 
What does it mean?
This tactic is genius in its simplicity. The idea is to keep the attention on your opponent by simply peppering them with the ways in which they fail to be perfect. No one is perfect and so the rule is powerful.
In fact, it is one of the most powerful tactics in the Alinsky arsenal. We will see as we go along that this rule, along with the fifth rule and the thirteenth rule are the heart and soul of how the Obama Administration uses Alinsky rules to their benefit.
Alinsky points out the Christian church because it was through the churches in Chicago that he first began to implement his strategies. When he approached Pastors, he found that it was nearly impossible to speak to them about Christianity (or so he says) because they were focused on the church, the people, the money and all that made up the infrastructure of the institution and not on the philosophy or theology that guided that institution. 
Why is this important to understand? It points out a basic flaw. People often profess one thing and then live in complete contradiction to what they profess, or at the very least neglect the things they claim to be most important in favor of the most expedient.
Let us be clear that people being people are generally going to fall short of any expectations they put upon themselves. The key Alinsky found was that this could be used to discredit those making claims they did not live up to. It is a deceptively simple and powerful tactic.
For example, suppose someone you know is encouraging you to stop smoking (oh, I don’t know let’s just say it’s the President of the United States) because they assure you that they are concerned about your health. They know the dangers of tobacco and they care about you. You really need to stop smoking so you can be around to be their friend.
Now let’s suppose you find out that this person (oh, I don’t know let’s just say it’s the President of the United States again) is actually smoking themselves. The next time they tell you that you need to quit smoking, what is the first thing you’re going to say? You are going to say, “Hey, wait a minute. Don’t lecture me about smoking when I happen to know you do it yourself”. You would be telling them to live up to their own book or rules-this is Alinsky’s fourth rule, and it is a strategy against which it is difficult to defend.
How has Obama used it?
Sarah Palin: In an article entitled, “I still hate you, Sarah Palin” the author lays out how Obama eviscerated Palin with Rules for Radicals and finishes by saying this,
“What you clowns need, in other words, is a Rules for Radical Conservatives to explain what you’re up against and teach you how to compete before it’s too late.” 
In essence what I am presenting through these series of articles is the framework of just such a manual for Conservatives (yes, a book on this does exist). While Conservatives are beginning to come around to what Rules for Radicals is all about, I have been screaming about it for way too long now.