October 04, 2010 at 08:28 PM EDT

Image Credit: Frank Ockenfels 3/AMC; Mary Ellen Matthews/NBCIf I didn’t know better I’d say Tina Fey really likes Mad Men.

The 30 Rock Emmy winner—who wisely finds every available opportunity to work Mad leading man Jon Hamm into the show (including the upcoming live outing)—has now tapped his costar, John Slattery, to guest-star, sources confirm to me exclusively.

I’m told Slattery will play a candidate running for congress in this season’s seventh episode.

Speaking of Slattery, how awesome was he on last night’s MM? Discuss below.

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