The one-hour Maryland gubernatorial debate between Martin O'Malley (D) and Bob Ehrlich (R) airs on MPT, "Election 2010: The Governor Debate" (at 7 p.m.), and is moderated by WJZ's Denise Koch.
E! correspondent (and Washington area native) Giuliana Rancic and her husband, "Apprentice" winner Bill Rancic, return for a third season of their reality show "Giuliana & Bill" (Style Network at 8), and this season, continue to chronicle Giuliana's attempts to get pregnant.
Acoustic music is provided for the dance numbers on the fourth competition week of "Dancing With the Stars" (ABC at 8).
After always being teased mercilessly about being from Canada, Robin tries to show everyone that she's got what it takes to be a real New York resident on "How I Met Your Mother" (CBS at 8), which has a cameo from the one and only Maury Povich.
"God in America" (WETA and MPT at 9), a documentary about the history of the relationship between religion and democracy in America since the 1600s, is previewed by Hank Stuever.
Three-part miniseries "Carlos" (Sundance at 9), which Stuever called in his Sunday review a "mesmerizing but certainly too-long biopic," covers the life of the international terrorist Carlos the Jackal, beginning with his reign of terror in London.
A string of popular authors sit down on new series "Hardcover Mysteries" (Investigation Discovery at 9) to discuss the inspiration for their books, starting with David Baldacci and the idea behind his best-selling 1996 novel "Absolute Power." Next week: Lisa Scottoline.
Original movie "Reviving Ophelia" (Lifetime at 9) -- based on the book -- centers on two sisters who each have a teenage daughter, and what happens to the family when one of the daughters gets involved in an abusive relationship.
"The Real Housewives of Atlanta" (Bravo at 9) continues the new season as Kandi (who is at least partly responsible for castmate Kim's tune "Tardy for the Party") collaborates on a song with Ne-Yo, while NeNe leans on new cast member Cynthia for support when life gets hard.
After last week's mission of asking out Taylor Swift, the next item on the to-do list for the guys on "The Buried Life" (MTV at 10:30) is getting married in Las Vegas -- so the three of them head to Sin City for 72 hours to find a wife for Dave.
Actor Jim Parsons stops by "Late Show With David Letterman" (CBS at 11:35), along with educator/documentary film subject Geoffrey Canada and musical guests Mark Ronson and the Business Intl. with Q-Tip.
"The Tonight Show With Jay Leno" (NBC at 11:35) hosts actor Jay Mohr, football player/reality star Chad Ochocinco and a performance by Travie McCoy.
-- Emily Yahr