In short, this (anonymous) person said, the Republican Party had been a stool supported by three legs: national defense, free-market economics, and social values. But the person said that thanks mostly to President George W. Bush, the party has failed on the first two legs. The country has shifted significantly on the last one, and there's nothing a Republican candidate can do to change it. As a result the Republican Party is in disarray, and Trump is taking advantage.