Dial testing makes another showing on the campaign trail.

If you’ve been living under a rock for the last 24 hours, you may not know that last night’s debate was one for the record books.

As has been tradition for years, CNN used dial testing during last night’s debate.

They were measuring the feedback of undecided voters in Ohio. Respondents reacted to the dialogue between President Trump and Former Vice President Biden. (It is up for debate if you can really call what happened last night a ‘dialogue’.)

More on dial testing for politics

All about dial testing for moment-to-moment feedback