The article explains how tricky it is to use statistics to pick which pollsters to believe.
Writing Tip on Creating Images
First, consider making a simple spreadsheet to illustrate your point. It's smart to keep it fairly small, so it fits and can be as visible as possible. Add a border so it does not fade into the background of the web page.
Second, publish your image in a site that you control, to establish your copyright, before publishing it in someone else's online magazine.
You could place it on Flickr, for example, and set precisely the restrictions that you want. Or you could make it open for anyone to re-use or adapt. At the least, you should license it "with attribution" so your name will spread.
By the way: read the Terms of Service ('TOS') before you start storing images online. Some people have complained that various sites say that you give up all control over images displayed on their pages.
It's not a case of "don't trust that magazine publisher"; rather it is a matter of establishing control so you can use the image yourself in the future.