The political descendants of the Solidarity trade union, which set into motion the collapse of communism in Eastern Europe and the end of the Cold War, are poised to return to power in Poland for the first time in a decade in the political wilderness. Parliamentary elections will be held Sunday, with a presidential vote to follow two weeks later. The parliamentary ballot is expected to mark the end of the Democratic Left Alliance's and close out the career of Kwasniewski. The left-wing leadership likely will be replaced by a pro-market government, as two conservative parties are far ahead of...