Shokwave's experiment proves only one thing: that cartoonists prefer to pick on the country's leaders than the also-rans of the opposition. A better exercise would be to take an article and note down all the facts that have been related therein (preferably checking them against another source). Now show the sheet of facts to someone who has not previously heard of the story. Ask them for their personal feelings on the subject. Then show them the article, and see if this has changed their perception of the issues.
Whether this experiment is scientific or appropriate to the question is irrelevant. The point is to show you what you should be doing every time you read, see, or hear an item of news: discerning the facts from the bullshit.