The ruling coalition would need to win 50 seats of the 125 up for grabs in order to retain its majority. TOKYO: Japan's shaky minority government is poised for another setback in an upper house vote on Sunday (Jul 20), an outcome that could jolt investor confidence in the world's fourth-largest economy and complicate tariff talks with the United States. Prime Minister Shigeru Ishiba's Liberal Democratic Party (LDP), which has ruled for most of the post-war period, and its partner Komeito, are