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Sunday on Cable: “Boardwalk,” “Treme,” “Dexter”

The pay-cable channels are still rich with new Sunday night material that includes Latinos, like Bobby Cannavale in Boardwalk Empire at 9P on HBO and Jon Seda on Treme at 10P, also on HBO.  And Dexter continues its craziness at 9P on Showtime, featuring incredible work by Lauren Vélez, David Zayas, Aimee Garcia and not so good news for Santiago Cabrera, while Morena Baccarin plots and schemes with the best of ’em on Homeland, at 10P on Showtime.