Political opponents or even neutral news sources would never be allowed to use photos, video, or presumably audio of the candidate doing bad stuff. We would have been denied the greatness of Romney’s “57%” speech, for instance. In such a case, the news would be able to WRITE about it (presumably) or do WSJ-style sketches maybe, but it would lack the impact and immediacy of photographic proof.
Kind of a strawman, but what if you acquired a picture of Trump hugging David Duke and needed to get him to sign a waiver in order to publish it? You’d never be able to actually use the photo because Trump would never allow it. You’d write an article describing the picture, but since no one would be allowed to see it Trump (or anyone, really) could just wave it away - “Oh, we’re not hugging in the picture; it’s just a weird angle. I’m actually stabbing him in the stomach. Believe me.”