Leftwing publication and website that rapidly deletes comments that show how they're wrong. There are two very strong reasons why even their most ardent supporters should avoid linking to them:
1. As of at least 2007, their old entries (and the entries at Kevin Drum's old CalPundit site) were clogged with the worst spam imaginable. Linking to pages containing ads for disreputable products and potions might cause search engines to think you're part of those spammers' networks.
2. As of October 28, 2010, they have a sidebar block containing links to very "interesting" sites. Those links don't have the nofollow attribute, which means if you link to a Washington Monthly page some of your "link juice" will eventually flow to those selling those "interesting" products. As with the first, that might cause search engines to think you're part of the network selling those "interesting" products.