Monday night, CNN airs the New Hampshire GOP debate (at 8), moderated by John King; candidates participating include Rep. Michele Bachmann (Minn.), businessman Herman Cain, former House speaker Newt Gingrich, Rep. Ron Paul (Tex.) former governor Tim Pawlenty (Minn.), former governor Mitt Romney (Mass.) and former senator Rick Santorum (Pa.).

After last week’s incident with the deceitful Bentley, Ashley tries to move on during “The Bachelorette” (ABC at 8), as she and the 12 remaining men travel to Thailand. In addition to exploring the coast, Ashley and the contestants head to an orphanage to visit children who lost their parents in the 2004 tsunami.

Even though her biological daughter was given to another family at the hospital, Regina has no interest in joining a lawsuit against the hospital on “Switched at Birth” (ABC Family at 9), which causes Kathryn, the woman whose child was switched with Regina’s, to become suspicious.

A woman heads to Mississippi for a relaxing vacation, but that plan doesn’t work out when she discovers a dead body and winds up involved in the search for a serial killer in “Carnal Innocence” (Lifetime at 9), a made-for-TV movie based on a book by Nora Roberts.

Paul Liebrandt is profiled in the documentary “A Matter of Taste: Serving Up Paul Liebrandt” (HBO at 9), which looks at how the British chef rose through the ranks of the competitive New York City food scene and opened his restaurant, Corton, in Tribeca.

Natasha Bedingfield stops by “Platinum Hit” (Bravo at 10) to serve as a guest judge as the contestants take a road trip to get inspired to write lyrics.

Trainer Chris Powell shows up in Franklin, Tenn., to help a 45-year-old bachelor, who weighs nearly 500 pounds, with his physical health and personal life on “Extreme Makeover: Weight Loss Edition” (ABC at 10).

Adm. Michael Mullen visits “Late Show With David Letterman” (CBS at 11:35); Actress Betty White reads the Top 10 list, and Black Joe Lewis & the Honeybears perform.

“The Tonight Show With Jay Leno” (NBC at 11:35) hosts actor Jason Sudeikis, singer Adam Levine and musical guest Ziggy Marley.

— Emily Yahr