It may go like this:
#1: Kyle Busch
#2: Kurt Busch
#3: Jeff Gordon
#4: Jimmie Johnson
Keep in mind, some/many/ or all may not agree, a question like this is asking for "Opinions", and Opinions are what you will get.
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That would depend on what fan you asked, I sure you would get a lot of different opinions on who the worse driver is. I even have one myself.