I get the feeling there is a connection between Clinton and Dean
question is .. how to prove it and fine the truth
I think the person who told you that was being silly. Certainly any of the above would like to see or exploit GOP schisms for various reasons, but that doesn't mean that the schisms are necessarily artificial.
Not everyone disappointed by President Bush on a given matter are in the tentacles of some dark cabal. To think so is to misunderstand reality.
Frankly, I hope the person who told you that was just having a bad day, and isn't reflecting the collective wisdom of any Republican brain trust. It's on such tenuous thoughts that bad governance and electoral strategery might be based.