Unfortunately, Poles are quite opposed to nationalistic, anti-EU and pro-Russian policies that the LPR (League of Polish Families) have put forth.
I believe the party temporarily had 14% of the votes after the European Parliament elections in June 2004. (second strongest)
Prior to the 2003 Polish referendum on EU membership, the LPR campaigned vehemently against it, denouncing it as a "centralised, socialist superstate". Officially, the LPR declares that it favours a "Europe of nations"
Suspicious attitudes held by the left-wingers and anarchists led to Giertych having a 140,000 person petition signed to remove him from his post as Minister of Education and vice-premier in 2006.
(The LPR had joined a governmental coalition with PiS before that, and Kaczynski gave him that post)