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Critic’s corner: What’s on TV Tuesday night

Christopher Buchanan/Insignia Films

Constitution USA With Peter Sagal  9 p.m., Channel 2

You’ve probably heard him on NPR’s “Wait Wait … Don’t Tell Me,” where he is endlessly witty. Now you can see him, and his significant eyebrows, on this new four-part series. Sagal takes a cross-country motorcycle trip to explore the contemporary relevance of the Constitution. Among the issues he addresses with the people he meets: same-sex marriage, presidential power, the separation of church and state, medical marijuana, gun control, and health care.

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Conan  11 p.m., TBS

Three of my favorites are on tonight, so I thought I would foist that information on you. First is Edie Falco, whose “Nurse Jackie” is so steadily engaging and honest. Then, Marc Maron pays his almost 50th visit to Conan, to promote his amusing new IFC comedy. And finally, Iron & Wine, led by Sam Beam, performs from their new album. While the new sound is too jazzy and soft-rocky for me, his trademark low-fi banging-acoustic sound on “Woman King,” “The Shepherd’s Dog,” and “Around the Well” is beautiful.

The Mindy Project  9:30 p.m., Fox

Bill Hader returns. So does the funny, I hope.

NCIS  8 p.m., CBS

Colin Hanks guests, fresh from his role as Allison on “Burning Love.”

Splash  8 p.m., ABC

This series is all wet.

Matthew Gilbert can be reached at gilbert@globe.com. Follow him on Twitter @MatthewGilbert.
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