A senate by-election victory in Rybnik for a candidate backed by the opposition Law and Order (PiS) party has sparked tangible unease in prime minister Donald Tusk’s Civic Platform (PO) party, observes the daily.

Although only a local election, the poll was considered a key bellwether ahead of the European Parliament elections next year.

The defeat of the PO candidate, who came in third, is seen as yet another blow for Tusk, after the inhabitants of the city of Elbląg, considered to be the ruling party’s stronghold, dismissed the mayor and PO-dominated city council last week.