for an imperial election? Sure. For a Hungarian election, see
@Zygmunt Stary 's point about the limited revenues.
Also, Hungary elected dynasties, not individuals (like in Poland/Bohemia). So there'd be no reason that Wlad III couldn't get them to accept his brother as king of Hungary. Especially if he goes the Vlad Bene route and grants his brother land inside the kingdom (like Vlad Bene did with Glogow in Bohemia for Sigismund) although I'm not sure what would make him decide this.
@Fehérvári @Tibi088 @Monter can correct me.