In the legislative systems I know individual politicians always have a single vote, although in some cases they may influence other members votes behind the scenes. In the Netherlands it is possible for a single politician to control an entire party (Geet Wilders) but this still doesn't confer extra votes to that person.
Are there any systems in which a single person can cast more than one vote? Say, it is possible to get elected from two districts at the same time or perhaps certain districts have a bigger vote share for their representatives.