*Puting the gun away*
Mothers are holy. But why does she vote for them?
Well... um... good question. She´s not here, otherwise I could ask her.
She´s not a communist, if you thought that. I think most PDS voters aren´t. Aside from being a pacifist (she usually voted for the Greens until 1999, when they backed the NATO intevention in the Kosovo) I suppose she votes for the PDS for the same reason most other PDS voters go for that particular political party: East Germans who are pissed off by the "West German-dominated" Federal republic because their home country (although they disagreed with its political elite) was "annexed" in 1990.
The PDS presents itself as party, which is pursuing "East German interests". Anyway, I think it has a lot to do with psychology. I do not pretend to fully understand it either. I was still a child when the wall came down and my political socialication took place mainly during the 1990ies after the re-unification. Well, sometimes I´m successful in persuading her to vote for SPD or the Greens.