Before book 6 I would've said Dumbledore, but he's dead, and Voldemort is alive, so it's gotta be him. Secondly, How could Snape get more votes than his master??? If Snape was more powerful than him, Voldemort would either be dead already, or serving Snape. Lastly... there's no way Harry's stronger than Voldemort, even if he does kill him in the end it will be with alot of help.