demagogue definition - a person, esp. an orator or political leader, who gains power and popularity by arousing the emotions, passions, and prejudices of the people.
that is exactly what Obama is, and did, to herd the people into supporting him. This is blatantly obvious in most any post of his passionate supporters... they where had, hook, line, and sinker; and cannot not see it if you slapped them upside the head.