Twiki has a voting tool

VotePlugin < Plugins < TWiki: "VotePlugin
This plugin might be used to establish an online-voting system. Votes are collected in a separate file ... basically inspired by the TWiki:Plugins/PollPlugin.

Example
%VOTE{id='FavoritMeal' select1='Drink' options1='Beer,Wine,Milk,Water' select2='Food' options2='Steak,Bread,Pasta,Pizza'}%"