I am getting the exact same error as Philex, and what I get in the Chrome console mirrors what they have posted.
I was originally getting this error using version 2.66 (which is the first version of WP-Polls I have tried). So I’ve installed 2.67 now which has not made any difference. This is on a fresh WordPress installation, the only other plugins I have is ‘Better WordPress Minify’, ‘Responsive Lightbox’ and ‘WP Parallax Content Slider’.
When I click on the ‘Visual’ button of the editor, I get an additional error:
Uncaught TypeError: Cannot read property ‘body’ of undefined
in
wp-includes/js/tinymce/tiny_mce.js?ver=359-20131026:1
The only way I have been able to edit posts is to disable Wp-polls, edit my post, then re-enable Wp-polls afterwards. I do this every time I want to make an edit.