"It allows me to see how people's opinion have changed over time," he explained. "I'm trying to isolate that moment that made the difference."
I'm calling shenanigans!
If that was the case why is it only one guy? If Luntz was looking to see a shift in their beliefs throughout a period of time, reason would suggest that he would have more than one person back. I didn't notice any other people in the videos that looked like they were in both videos.