Peeing match also known as the book by Peter C. Newman on Mulroney

In this peeing match also known as the book by Peter C. Newman on Mulroney, where is any mention of Mulroney's comments on Joe Clark?

Next question. If Jim Prentice is running again in the next election, and is going to stick around to take another run at being leader, why is he folding up his law practice and moving it into another law firm?

Is he chickening out again?

He did it once with the race he backed out of in Calgary Southwest against Stephen Harper.