Use a full option polling functionality to get the answers you need. YOP Poll is the perfect, easy to use poll plugin for your WP site.
It works nicely at the front end, but due to an excessive number of requests to admin-ajax.php puts massive weight on the server, meaning unfortunately i'm going to have to uninstall it.
If they can tidy it up and clean the code out i'd happily try it again, but as it is now, it's hard to recommend.
wanted to like it.
CSS is all messed up, going back and forth between results and vote.
plugin uses over 25 different files -- way too many http requests.
do not recommend, sorry.