If you were a mole in the Republican Establishment and you wanted to cement Donald Trump's takeover of your party, what could you do to remind everybody what it is that they hate about the Establishment that Donald Trump is so successfully exploiting?
How about trotting out the guy you nominated last time who has become symbolic of the kind of hollow mediocrity that characterizes the Establishment and putting him on national television to denounce the guy who you've got to know will point to this very television appearance as one more piece of evidence of how utterly incompetent and out of touch the Establishment is?
That's a long sentence, I know. But the short version is this: Putting Mitt Romney on television to try to explain why Donald Trump is bad for the country is about the best gift you could give to Donald Trump and I can't believe anyone--even the boneheads making the decisions for the national party (a rather low standard, I admit)--would think it was a good idea.
The Establishment is going to beat Trump, who is popular precisely because the Establishment doesn't like him, by telling everybody that it doesn't like him.
I just keep reminding myself that all of this is just a reality show written by Donald Trump.