Shinzo Abe’s decision to call parliamentary elections early could prove to be a gamble Prime Minister Shinzo Abe has gambled his career by calling snap elections to the Lower House of the Japanese Diet in late-October. The term of the House would have ordinarily lasted another year, but he clearly senses a turn in the popular breeze in his favour. Whether the electorate will vindicate his judgment, however, may well depend on the grit and tenacity of his challenger, Tokyo’s first woman Governor, Yuriko Koike. The former television anchor achieved an unprecedented feat last year by taking the city’s top job, trouncing the official nominee of Mr. Abe’s Liberal Democratic Party in a triangular race. Ever since, Ms. Koike, who had served briefly as defence minister during Mr. Abe’s first term in 2006-07, has become accustomed to thriving in a crisis. In a repeat of her growing penchant to take on a male-dominated establishment, Ms. Koike floated a local party earlier this year, which sp...