[My brief impression in square bracket.]
Democratic Party of Japan, Yoshihiko Noda: "What matters is decision [in the very large font]. Responsibility for today and for the future." [or "What matters is the ability to decide." Noda's left eye and right eye look as if they belong to two different persons. Scary.]
Liberal Democratic Party, Shinzo Abe: "Take back Japan" [Take back from whom? Gazing into distance, not looking at you, with eyebrows that reminded me of Gromit. To my amusement, LDP now call themselves "Lib Dems", like the Lib Dems in the UK. As we all know by now, LDP is not liberal, it's not democratic either.]
Boy-wonder's Japan Restoration Party: "Rebirth of Japan, responsibility for the future." [If anyone get inspired by looking at this poster, he/she will fully deserve whatever comes after this party is elected.]
Japan's Future Party: "Future where everyone can have hope." [Mr. Tetsunari Iida and Ms. Yukiko Kada, both of whom changed part of their names from kanji to hiragana for the election so that voters can easily write, without mistake. Sorry to say but I find very little personal charm in these two. Mr. Iida had better get a decent haircut.]
Japan Communist Party: Kazuo Shii, "We propose, we act." [Mr. Shii, you are not an enka singer. Sorry. The look is the 70's look...]
New Party Nippon, Yasuo Tanaka: "I know who to protect" [his word. "I don't make mistakes in choosing who to protect" - criticizing DPJ and LDP for putting big businesses first.]
My personal favorite is Mr. Tanaka's poster. He looks calm and not prone to over-promising. Despite the silly gesture, I also do like Mr. Shii, smiling at us, looking like a good sport.
As far as the color scheme goes, DPJ's Noda and New Party Nippon's Tanaka are the winners to me. The colors (red or dark red background, very dark suits) portray substance, whether the substance is actually there or not. Mr. Tanaka could have chosen a better tie.
Someone couldn't help faking a poster for Goshi Hosono: