Japan's ruling bloc heads for hefty win in vote, but just how big?

By Linda Sieg TOKYO (Reuters) - Prime Minister Shinzo Abe's ruling coalition looks to be headed for a comfortable victory in an election on Sunday for parliament's upper house, despite doubts about his economic policies and his goal of revising the pacifist constitution. Abe's coalition is in no danger of losing power in the election for half the 242-seat upper house, which means interest is focused on just how big a victory the ruling bloc and its allies can chalk up, including whether they get a two-thirds "super majority" needed to try to revise the post-war constitution for the first time. A push to ease the charter's constraints on the military operating overseas could lead to tension with China, where memories of Japan's past militarism still arouse anger.