The website I found to be an effectively designed website is http://enditmovement.com/. This website uses emotional power to communicate the foundation's purpose and its mission. The website uses both pictorial and numerical images on the home page of the website. If you scroll almost to the bottom of the page, there are facts and figures concerning slavery and its prevalence around the world. All of the words and captions on the website are simple and straightforward and direct.
Anti-abortion, religious websites would be an example of the use of emotional power. I won't link to any since the sites are usually very graphic, but you can Google "Army of God" or "Wicked Shepherds" to see what I mean.
