The left destroys anyone who is a threat to their entrenched power. They keep a file on each potential threat. When they need something, they look in the file. If they don’t have anything, there is always some deceitful democrat who is willing to lie and/or violate the person’s privacy to dig into his personal life.
It's not just the left. The Republican Establishment thinks exactly the same way about conservatives.
Look at how viciously Romney attacked Gingrich, and then how meekly and gently he "criticized" (barely) the Chosen One.