pagination not working

I am having trouble with getting my pagination to work correctly. I have five different pages on my site that list posts. Each page lists a different category of posts. The posts are quite long and therefore I only list one per page. It is a simple process that I have used many times before but for some reason it is not working now. I will show you the code and the site is here.

<?php  $catname = 'thisweekfromcaliforniahistory';
	$wp_query = new WP_Query();
	$wp_query->query('category_name='.$catname.'&showposts=1'.'&paged='.$paged);
         while ( have_posts() ) : the_post();
          get_template_part( 'content', 'page' );
          comments_template( '', true );
	 endwhile;
	twentytwelve_content_nav( 'nav-below' ); ?>

Seems like it is pretty simple. I have seen plenty of support posts doing the same thing. The problem is that each time I click older posts I get the same post over and over.

Any help is appreciated. Thanks