Japanese were voting Sunday for seats in the smaller of Japan's two parliamentary houses in a key election with Prime Minister Shigeru Ishiba and his ruling coalition facing a possible defeat that could worsen the country's political instability. Voters were deciding half of the 248 seats in the upper house, the less powerful of the two chambers in Japan's Diet. Ishiba has set the bar low, wanting a simple majority of 125 seats, which means his Liberal Democratic Party and its Buddhist-backed junior coalition partner Komeito need to win 50 to add to the 75 seats they already have.