I had to take a Myer-Briggs personality type test when I volunteered years ago for the Big Brother-Big Sister program. My category came back as ESTJ (Extrovert, Sensing, Thinking, Judgmental) but it was closely balanced on the Sensing/Intuition and on the Thinking/Feeling score so it could as well have been a ENFJ (Extrovert, Intuitive, Feeling, Judgmental). In other words, I'm the guy who'll talk to anybody and everybody ("E") and prefers to have matters settled (the "J"). In terms of decisions, I balance current conditions and intuition (S/N) and make detached decisions but am tempted towards building consensus (T/F).
Canonical ESTJs ("supervisors"), according to Keirsey, are George Washington and Sandra Day O'Connor; canonical ENFJs ("teachers") are Oprah Winfrey and Ralph Nader. Consider me, then, a cross between George Washington and Ralph Nader!
The reason I was reminded of all this was an article suggesting that Hillary Clinton is an ESTJ as well. Barack Obama, who I've been shilling for? He's an ENFP (ENFPs are idealists who can build consensus and motivate others to do their best -- they're rare, only 2% of the population. Kiersey calls them "champions"). And John McCain is ESTP (ESTPs are practical and focused only on what is currently possible. Kiersey calls them "promoters"). So, why is it that my choices in the coming election (if the INS will get us our citizenship papers in time for me to vote in November!) are Obama, then McCain, then Clinton? Based on similarity of outlook, Clinton's the closest, then McCain, then Obama ... maybe because I realize how rare an idealist, unifying president would be!
P.S. There's a short online version of the Myer-Briggs that seemed to give (for me at least) results that were reasonably close to my full test results. I no longer volunteer for the Big Brother/Big Sister program. The reason is a long story, one that I'll reserve for another time.