Experts say deepfakes will be used to swing the 2020 election. deepfake video featuring an actor made to look and sound like the comedian Joe Rogan surfaced last week, stunning for its audio and visual accuracy. And Rogan was a great choice: He’s put out hundreds of hours-long video podcasts. There is a lot of material to work with. If you’re not yet aware of what a deepfake is in the first place, it’s a way of using artificial intelligence to create fraudulent audio or video that sounds and/or looks like a particular person. In this case, we’re seeing a...