Republican strategist Frank Luntz came down hard on Donald Trump’s Republican presidential debate performance, calling it a “destruction of a candidacy.” The CBS News contributor explained to “CBS This Morning” why Trump did not do well with the post-debate focus group he conducted. “What do you say when you won’t guarantee to support the Republican nominee, when you call women some pretty horrific names, when you insult the moderator of the debate, when you don’t answer questions specifically, when you can’t even explain why you even went bankrupt. I have to tell you, this was an amazing debate performance. Not...