Translation:Hungarian politicians do not have a spine, either.
That comes from "sincs".
If it were nincs: .... nincs gerincük. they have no spine
... sincs gerincük. they have no spine either.
Someone explained it at some another sentence: it is like "sem" is the child of is+nem, and sincs is the child of is+nincs.
So here is the family tree:
nincs = nem+van
sem = is+nem
sincs = is+nincs = is+nem+van