Sigh. You all got it wrong. The main opposition party is not sth-right or sth-left, but a kitbash of left-wing (mostly economy and state-pervassivness) and right-wing (i.e. education, Church relations, foreign politics). The post-communists are barely on the left. The main ruling party is a ruling party - doctrine is pretty much inexistant. The PSL cares only about it supporters, no ideology there either. Personally, I don't think any of the parties in Sejm are following any ideology, besides getting money. They're all pretty much consisting of a leader, the court and yes-men.