If you don't want to see the Politics forum posts when you get the new posts, here is the way to exclude them:

http://www.xoutpost.com/forums/search.php?do=getnew&exclude=85

Make a bookmark with your browser with this URL (not the URL for the Search Results page you get after you execute the above URL that has the token "searchid" in it).

You can use the "include" keyword as an alternative if you only want to see certain forums. You can provide a comma separated list of forum ids.

http://www.xoutpost.com/forums/search...4,5,6,7,8,9,10

I don't know of a way to get the forum ids other than trial and error (I sequentially excluded ten at a time and then when the Politics forum didn't appear in the 81-90 searched within that to find the Politics forum id).

The site admins can likely provide a list if they're so inclined