The oratory skills of Barack Obama were the tools to rise to presidency, many commenters say. Where in the chart are they? Where to look for?
Mercury is the planet of communications. His Mercury is 22.5 (half semi square) the importan midpoint Sun/Moon. This means that he is a communicator at heart. Mercury is also 157.5 degrees from ASC/MC: communications are of crucial importance. Mercury is also trine Midheaven, reflecting the importance of communications for the career.
Jupiter is the symbol of conviction and convincing others. Jupiter is opposition Mercury and related to the same important midpoints as Mercury is. Jupiter is 157.5 degrees from Sun/Moon and 22.5 degrees from ASC/MC. Jupiter is sextile Midheaven.
Gemini is the sign of communications. The Moon expresses a need or the way a person has been trained or eductated. Barack Obama's Moon is in Gemini, sextile Mercury and trine Jupiter. This combination again points at communications.
It is clear that communications are important in his natal chart. The progressed chart of Obama tells us more about his present position as the leader of the government. See that post: http://astropost.blogspot.com/2008/12/progressed-chart-and-how-one-grows-into.html
For more about the charts of Barack and Michelle Obama, click the label. Information and examples including Mercury are to be found under the label 'Mercury'.