I have some news to share: after three-and-a-half years at the Washington Monthly, I’m moving on. My last post will be tomorrow and I’ll start my new career at MSNBC on Monday morning.

Working for the Monthly has been an amazing experience, but I’m thrilled about an extraordinary opportunity at MSNBC: I’m going to be a producer for “The Rachel Maddow Show” and an MSNBC contributor. Don’t worry, I’ll still be blogging; I’ll just be writing at a new online home.

It’s not easy for me to leave the magazine. I’ve been reading the Monthly since I was an undergrad, and being part of the team has been an honor. Editor-in-Chief Paul Glastris is a friend and a mentor, and everyone here is a pleasure to work with, making this a bittersweet departure.

I always said I wouldn’t leave this job unless something truly special came along, and fortunately for me, something did. The chance to work for Rachel and MSNBC is a dream gig that I couldn’t be more excited about.

If you’ve come to value Political Animal, rest assured, I’m leaving the site in very capable hands, and will reveal more about the site’s future tomorrow. For now, however, I want to thank the Monthly for nearly four great years, Rachel and her team for the amazing opportunity, and all of you for the support and encouragement.

(By the way, don’t leave — this isn’t my last post of the day. In fact, I’ll maintain a usual posting schedule until close of business tomorrow.)

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.