Cardoza Worpress Poll a WordPress plugin by Vinoj Cardoza is an ajax powered polling system. This poll plugin supports both single and multiple selection of answers.
This poll is developed using MVC framework which uses both ajax and jquery.
You have options to display more than 1 poll in the widget area.
You can specify how many polls to be displayed in the archive page.
Plugin homepage: http://fingerfish.com/cardoza-wordpress-poll/