WordPress comes pre-packaged with an RSS feed widget. You can use this widget to add an RSS feed of your campaign archive to your WordPress site.
From your WordPress Admin Panel, go to 'Appearance,' then 'Widgets.' Drag the RSS feed widget from 'Available Widgets' to the desired Widget Area (each theme will have different Widget Areas available).
First enter the RSS feed URL of your campaign archive. To find this URL, view one of the campaigns from your campaign archive. Within the archive toolbar at the top, click on RSS. The resulting page will have your RSS feed URL. The format should look something like this: http://www.x.com/a/feed/xxxxxx
After you've entered the URL, you can add an optional title and choose how many items to display. There are also checkboxes for displaying item content, author, and date. When you're done, click 'Save.'
Please note that WordPress caches the RSS feed result for 12 hours, so you will not see updates to the feed any more frequently.