I think maybe you are oversimplifying this a little too much.  The system you described seems to have some big holes that could make it pretty easy to hack.  For instance, having a set list of nodes that everything runs through leaves a pretty obvious weak spot.  If someone managed to mess with enough of those nodes, they could maybe bring the whole system down and  or make fake nodes to rig the voting system.

Whats to stop someone from creating hundreds or thousands of fake nodes even on a single computer?