That article and your posting made me curious to explore even more & I found the application of the Human Design System to those & other celebrities an interesting continuation of that journey of discovery...

Just as a background, Human Design System is an interesting synthesis of ancient and modern knowledge, integrating astrology, the I Ching, the Chakras and the Kabbalah. One can learn more about it humandesignsystem.com

Based on the birth data & other information here are some of the results from the HSD charts:

Obama, Barack - Projector with emotional awareness & with throat, ji & root defined centers
Clinton, Hillary - Manifestor with mental awareness & with throat, ji & sacral defined centers
Clinton, Bill - Generator with intuitive awareness & with ji, root & sacral defined centers
McCain, John - Generator with emotional awareness & with ji, sacral & heart defined centers
Mike Bloomberg - Manifestor with mental & emotional awareness & 6 centers defined

You can actually see the detailed HSD charts and more - http://www.humandesignsystem.com/introduction/3.htm

I have posted more details in my Gaia blog - http://joybringer.gaia.com/blog
You can also even get your own free basic HDS chart done online & snail mailed to you.