ON WGBH
Greater Boston 7 p.m. WGBH (Channel 2) A look at Ballot Question 3: Should we legalize medical marijuana in Massachusetts?
PBS NewsHour Debates 2012: Presidential Debate at the University of Denver 9 p.m. WGBH (Channel 2) President Obama and Mitt Romney discuss domestic policy at the first presidential debate.
ON CHRONICLE
Bargains 7:30 p.m. WCVB-TV (Channel 5) A constantly changing consignment shop, rugs and appliances, and more.
RADIO HIGHLIGHTS
Boston Public Radio noon WGBH-FM (89.7)
Radio Boston 3 p.m. WBUR-FM (90.9)
NightSide With Dan Rea
8 p.m. WBZ-AM (1030) Reaction to the first Obama-Romney debate.
NEWS & TALK SHOWS
Morning
CBS This Morning at 7 a.m. on Chs. 4 and 12.
Good Morning America at
7 a.m. on Chs. 5, 6, and 9.
Today at 7 a.m. on Chs. 7 and 10; 10 a.m. on Ch. 7. Jackie Evancho performs.
Live! With Kelly and Michael at 9 a.m. on Chs. 5 and 9;
10 a.m. on Ch. 10. Tom Selleck; Heart performs.
The Ricki Lake Show at 11 a.m. on Ch. 25. Female sexuality.
The View at 11 a.m. on Chs. 5, 6, and 9. Jenny McCarthy.
Afternoon
The Talk at 2 p.m. on Chs. 4 and 12.
Anderson Live at 3 p.m. on Chs. 12 and 25.
Katie at 3 p.m. on Chs. 5 and 9; 4 p.m. on Ch. 6.
The Ellen DeGeneres Show at 4 p.m. on Chs. 5, 9, and 10.
Evening
Greater Boston at 7 p.m. on Chs. 2 and 11; midnight on
Ch. 2.
Conan at 11 p.m. and 1 a.m. on TBS. Ashley Greene.
The Daily Show With Jon Stewart at 11 p.m. and 1 a.m. on COM.
Colbert Report at 11:31 p.m. and 1:30 a.m. on COM.
The Tonight Show With Jay Leno at 11:34 p.m. on Chs. 7 and 10. Carol Burnett; Lang Lang and students perform.
Late Show With David Letterman at 11:35 p.m. on Chs. 4 and 12.
Jimmy Kimmel Live at midnight on Chs. 5, 6, and 9.
Late Night With Jimmy Fallon at 12:37 a.m. on Chs. 7 and 10.
The Late Late Show With Craig Ferguson at 12:37 a.m. on Chs. 4 and 12.
Last Call With Carson Daly at 1:36 a.m. on Chs. 7 and 10.
MOVIES
Borderline 8 p.m., midnight (LMN) Life unravels for a prison psychiatrist (Gina Gershon). R (2002)
Brokeback Mountain 8 p.m. (SHO2) Heartbreaker about two gay cowboys who fall in love in 1963 Wyoming. Heath Ledger. R (2005)
Cruel Intentions 8 p.m.,
10 p.m. (OXY) A high-school heartthrob bets he can bed a virginal classmate. Sarah Michelle Gellar. R (1999)
The Fifth Element 8 p.m.,
11 p.m. (AMC) A 23rd-century cabbie and an alien try to save the world. Striking visuals. Bruce Willis. PG-13 (1997)
Happy Endings 8 p.m. (SUND) Californians’ lives interconnect in this polyglot, multi-plot character study. Lisa Kudrow. NR (2005)
The Twilight Saga: Eclipse
8 p.m. (TMC) Bella (Kristen Stewart) faces a decision that could result in a war between werewolves and vampires. PG-13 (2010)
Pretty Woman 8:30 p.m. (FAM) Stellar fairy tale stars Julia Roberts as a hooker transformed by a corporate raider. R (1990)
The Sitter 8:30 p.m. (HBO) Irresponsible babysitter Noah (Jonah Hill) takes a trip to NYC with his three young charges. R (2011)
The Crimson Wing: Mystery of the Flamingos 9 p.m., 11 p.m. (APL) A look at a crimson-winged flamingo chick struggling to survive in northern Tanzania. G (2008)
The Lord of the Rings: The Return of the King 9 p.m. (STARZ) Frodo (Elijah Wood) is tempted by the power of the ring in the Oscar-winning finale. PG-13 (2003)
Must Love Dogs 9 p.m. (E) Amiable but bland romantic comedy about a divorcee wading into the dating pool. Diane Lane. PG-13 (2005)
Doppelganger 9:40 p.m. (FLIX) A woman is pursued by her ghostly double. Drew Barrymore. R (1993)