You, The People
The problem with democracy is figuring out how to keep The People from picking the wrong guy.
In the US, the safety valve is the Electoral College. If, in a race between Hitler and Santa Claus, The People choose Hitler. . .well, there's nothing really preventing the Electoral College from electing Santa, instead.
That said, fear not the not-quite-as-yet-scheduled Palestinian election. Certain, hidden powers-that-be, both within and without the PA, will make sure The People don't choose Arafat.