I’ve noticed that some images from some sites won’t post, as if they’re being protected by the site. But going to the article, you’ll see it. It’s the first one comparing attendance at Trump/Clinton rallies.
Here is a screen image I printed from the site.

Strange, the graph is now showing (post 1355)?
I can see it by right clicking the black box with the x, click properties and copy the url. Paste in a new tab.