Tokyo, July 21 -- Japan's ruling coalition is likely to lose its majority in the upper house in Sunday's election, according to exit polls conducted by Japanese media outlets, an outcome that will further weaken Prime Minister Shigeru Ishiba's leadership. A poll by public broadcaster NHK showed that the ruling coalition is likely to secure about 32-51 seats of the 125 up for grabs, likely leaving it short of the 50 needed to maintain a majority in the chamber. NHK said the ruling bloc faced "a difficult situation" to keep unfettered control of the 248-member body. It will be a second setback for Ishiba, following last October's poor result in the lower house. The weak chamber can't appoint a prime minister or hold a no-confidence vote....