The new generation, 20's and 30's, doubt mass media
The drastic change of public opinion in Japan mostly formed by young people played an important role in this election 9/11.
They were just apathetic people to politics.... but not any more. They seem to be more and more agressive in participating in public activities such as vote. What changed them? I say, it's internet, that is, message boards or blogs. According a survey (I don't remember the name), 61% of bloggers were for Koizumi just before this election.
I have been watching several famous message boards among Japanese. Several years ago, I saw so many writings, "No war, No military". However, those opinions have been dumped. They have learned, throughout a long time of discussions, that this idea, inheriting typical educations by schools and 6ch and 10ch in TV, was infeasible and naive.
I suspect that massmedia was the one which has seized the power in Japan since 1980s. The prime ministers had changed every one year so that people couldn't have time to assess and support them. it's because of massmedia, so they can freely accuse ministers of inadvertent, but trivial mistakes about their statements. A number of prime ministers resigned due to such misspeakings or scandals.
I think, after this election, that the message from the young people may be "No" to those massmedia, trying to manipulate the watchers.
The man in the picture is one of the major newscasters of 6ch, always critisizing the Koizumi's way. Well, at last people seemed to notice that someone, pretending to be the supporter of people, can't stop loudmouthing the governers.