You can now embed Google+ into posts and websites, including WordPress. It is really easy to add to your WordPress site as there are really only two steps here. The key being that you need to add the javascript to your header, so that when you put the embed code in your post, it knows what to do with it.
Edit your header and before the close of the </head> tag you want to add…
<script type=”text/javascript” src=”https://apis.google.com/js/plusone.js”></script>
Then when you go to your Google+ post you can choose embed from the drop down menu and it will feed you both sets of this code.
The result will be something like this…