This is an example of the Blogrush Code you were referring to.

<script type="text/javascript"><!--

blogrush_feed = "34785462";

//--></script>

<script type="text/javascript"

src="http://widget.blogrush.com/show.js">

</script>

You cannot add this to any of your hubs, because such code is only added to the html file of a website. (Unless Hubpages allow us to put such codes in our sidebar.) If you manage your own website, like through a wordpress blogging software, you can add the code, and have the blogrush widget in your sidebar. I think blogger.com allows users to add javascript codes in customizing their blogs, but Wordpress.com does not.