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I’m not sure what is happening there, but your site does throw several JavaScript errors that may be blocking normal page function. Chrome points out that Object #<Object> has no method 'swing' and in Firefox, when you click the petition widget button, it complains that v.easing[this.easing] is not a function.

The petition plugin doesn’t make use of any of the easing or swing methods of jQuery or jQuery UI. The image/story carousel at the top of your page does appear to use these methods. You might try disabling that carousel for a moment to see if the problems with the petition clear up.