Tokyo Gov. Yuriko Koike stepped down Tuesday as leader of the Party of Hope amid her waning grip on power in the fledgling party she founded, in the wake of its poor performance in last month's general election."I want to leave national political matters to Diet members. In that sense, I'm the founder, but I will step down as representative and support you all in an appropriate manner," Koike said at a party general meeting at which its new leadership was endorsed.The party leader post was filled by Yuichiro Tamaki, a lower house lawmaker who last week was selected as the party's co-head al…READ FULL ARTICLE