I use Thesis Wordpress Theme on IMTips and recently upgraded it to Thesis 1.8 and found that Thesis CSS scrambles Wordpress Polls Plugin if you put the poll inside your post body.
If you insert a poll inside the post, form elements take extra spacing. See the screenshot.

Thesis specifies the width of the input elements inside a post as
The intention is to make the comment form width 45% of the available width but this also makes the input fields and especially the radio buttons of Wordpress poll to take 45% width.
To solve the problem you have to enable Custom Stylesheet Options in the Thesis's Site Options Interface and then add the following property to your custom.css file.
The Issue
If you insert a poll inside the post, form elements take extra spacing. See the screenshot.

The Cause
Thesis specifies the width of the input elements inside a post as
HTML Code:
.format_text input, #commentform input, #commentform textarea { width: 45%; padding: 0.25em; border-width: 0.083em 0.083em 0.083em 0.083em; }
The Patch
To solve the problem you have to enable Custom Stylesheet Options in the Thesis's Site Options Interface and then add the following property to your custom.css file.
HTML Code:
.wp-polls input { width:auto;}
