Can't vote or see results

I’m inserting the poll by “[poll id=”999″]” code

I’ve followed this diagnose
http://codex.wordpress.org/Using_Your_Browser_to_Diagnose_JavaScript_Errors

And is telling me that:
ReferenceError: jQuery is not defined
jQuery(function(){

Can anyone help me?

Here, at the end of the post:
http://goo.gl/YrppfN

https://wordpress.org/plugins/wp-polls/