They don't closely follow Polish affairs. The fact that most of them believe that Jaroslaw Kaczynski is "conservative" and Komorowski "liberal" tells you that they know nothing.
Well, unless you're in Poland on a daily basis you don't necessarily realize that ceconomic and social policies don't line up in Poland the way they do in the west.
very roughly:
PiS, economically liberal (socialist really) but socially very conservative
PO, economically more conserivative than PiS and socially a little more liberal
SLD, economically between PiS and PO socially much more liberal than either
PSL, no discernible principles whatsoever, ****** who'll get into bed with anyone offering them a bit of power