John Slattery to Guest Star on 30 Rock

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30 Rock is dipping its toes back into the talented Mad Men water.

Following last season's successful stint by Jon Hamm on the sitcom, fellow cast member John Slattery has signed on to appear alongside Liz Lemon and company later this year.

The man who plays Roger Sterling will take on the role of a candidate for congress on this season's seventh episode, Entertainment Weekly reports. Slattery has actually portrayed a New York politician in the past.

He recurred in that capacity years ago on Sex and the City.

Lemon Law
John Slattery Picture

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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30 Rock Quotes

Jack: Never go with a hippie to a second location.
Liz: I need to do that thing that rich people do where they turn money into more money. Can you teach me how to do that?
Jack: With my eyes closed.

Hey, nerds! Who's got two thumbs, speaks limited French, and hasn't cried once today? [pointing thumbs at self] This moi.

Liz