That could work, especially for policy specifics and phrasing/messaging. But if I were the candidate running this con, I wouldn't even trust telling Luntz..Why would anyone bother to do that when they can just hire Frank Luntz? That's literally his job.
edit: my favorite Luntz moment so far this season came when he asked his focus group: who's more conservative - Jeb or Donald?
https://www.youtube.com/watch?v=2seEO-hQ9Jk
His incredulous "seriously?" was perfection.
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Separate note:
The Hillary camp has released this "Throwback Thursday" video tribute to tonight's GOP debate. Pretty damn slick, it reminds me of the Obama online team's work from 2012
https://www.youtube.com/watch?v=635qcb1Viuk
It's only the beginning of August, and we already have a wealth of great GOP soundbites.