▁ 4 6 0 ▁members ▁of ▁the ▁lower ▁house , ▁the ▁Se jm ▁and ▁all ▁ 1 0 0 ▁members ▁of ▁the ▁upper ▁house , ▁the ▁Senate . ▁ ▁The ▁election ▁resulted ▁in ▁a ▁swe eping ▁victory ▁for ▁two ▁parties ▁of ▁the ▁centre - right , ▁the ▁national - con serv ative ▁Law ▁and ▁Justice ▁( Pi S ) ▁and ▁the ▁liberal - con serv ative ▁C iv ic ▁Platform ▁( PO ). ▁The ▁inc umb ent ▁center - left ▁government ▁of ▁the ▁Democratic ▁Left ▁Alliance ▁( S LD ) ▁was ▁sound ly ▁defeated ▁in ▁a ▁lands lide . ▁The ▁two ▁vict orious ▁parties ▁won ▁ 2 8 8 ▁out ▁of ▁the ▁ 4 6 0 ▁seats , ▁while ▁the ▁S LD ▁was ▁reduced ▁to ▁fourth ▁place ▁with ▁ 5 5 ▁seats . ▁The ▁Pi S ▁won ▁ 1 5 5 ▁seats , ▁while ▁PO ▁obtained ▁ 1 3 3 . ▁ ▁Norm ally , ▁this ▁would ▁have ▁made ▁Pi S ▁leader ▁Jar os ław ▁K ac zy ński ▁Prime ▁Minister . ▁However , ▁he ▁decl ined ▁the ▁post ▁so ▁as ▁not ▁to ▁pre jud ice ▁his ▁tw in ▁brother ▁Le ch ' s ▁ch ances ▁for ▁the ▁president ial ▁election ▁held ▁later ▁in ▁October . ▁In ▁his ▁place , ▁Law ▁and ▁Justice ▁instead ▁nominated ▁Kaz im ierz ▁Marc ink iew icz ▁for ▁the ▁post . ▁Out going ▁Prime ▁Minister ▁Mare k ▁Bel ka ▁failed ▁to ▁win ▁a ▁seat ▁in ▁Ł ód ź . ▁ ▁In ▁the ▁Senate , ▁Pi S ▁won ▁