Well, it's the core of democracy: the right of never ever voting for a given candidate again. What you are writing about is probably denying to some people the right of candidating themselves or even the right to vote. There are examples: one of them is Italy banning the fascist party after WW2 and the descendants of the royal family.

Excerpts of Provisions XII and XIII of the Constituton, easily googlable:

> It shall be forbidden to reorganise, under any form whatsoever, the dissolved Fascist party

> The members and descendants of the House of Savoy shall not be voters and may not hold public office or elected offices

I read that Germany banned a right wing party that recently won quite a large share of votes. I'm not sure about the extent of the ban and if it's a ban at all.