The big political battle in Sunday’s Polish parliamentary election may be between the ruling Law and Justice (PiS) party, seeking a third term in office, and the opposition Civic Platform (PO) led by Donald Tusk, the former prime minister and European Council president. But with polls suggesting that neither side will have the votes to form a government outright, the decisive say in who rules Poland for the next four years could lie with Confederation, an eclectic far-right coalition of nationalists, libertarians and monarchists. As Poland enters the final days of campaigning, Confederation is polling at about 10%, which could...