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Jon Stewart hosts "The Daily Show" (midnight, Comedy Central) for the last time … and I'm at a loss for words.

Stewart turned that show into a television institution. There are not enough words to say how funny – and how important — "The Daily Show" has been.

I can't even begin to imagine television without Jon Stewart. Not that we're going to have any choice.

It will be hard to say goodbye.

Also tonight, the Republicans start debating on the Fox News Channel. The main event (7 p.m. MT) features the 10 GOP hopefuls leading in the polls — Donald Trump, Jeb Bush, Scott Walker, Mike Huckabee, Ben Carson, Ted Cruz, Marco Rubio, Rand Paul, Chris Christie and John Kasich.

The other eight — Rick Perry, Rick Santorum, Bobby Jindal, Carly Fiorina, Lindsey Graham, George Pataki, and Jim Gilmore — will appear in a warm-up event (3 p.m. MT).

Elsewhere on TV ...

"The Astronauts Wives Club" (7 p.m., ABC/Ch. 4): Betty Grissom makes arrangements for Gus' funeral — and learns his death may have been preventable.

"Food Fighters" (7 p.m., NBC/Ch. 5): A stay-at-home mom competes against the chefs.

"Boom!" (7 p.m., Fox/Ch. 13): Contestants who answer incorrectly can get hit with a hot fudge bomb.

"Beauty and the Beast" (7 p.m., CW/Ch. 30): The events of Cat's big day leave her doubtful that they can defeat the threat.

"Project Runway" (7 and 10 p.m., Lifetime): Season 14 begins.

"Big Brother" (8 p.m., CBS/Ch. 2): Another houseguest is evicted.

"Mistresses" (8 p.m., ABC/Ch. 4): Karen gets shocking news when she visits her doctor.

"Dates" (8:30 p.m., CW/Ch. 30): Mia and David decide to spend the day together with David's young children.. (There's a repeat episode at 8 p.m.)

"Under the Dome" (9 p.m., CBS/Ch. 2): A resistance forms against Christine.

"Rookie Blue" (9 p.m., ABC/Ch. 4): Andy and Sam are shocked to learn that Oliver is the prime suspect in IA's corruption investigation.

"Complications" (10 p.m., USA): Holden forces John to testify against the Latin gang; Samantha's past threatens her marriage.

"Sex&Drugs&Rock&Roll" (11 p.m., FX): Gigi's a hit in New York City, which leads to the revelation that the Heathens are still popular in Belgium.

"Lip Sync Battle" (11 p.m., Spike): "Broad City" co-stars Abbi Jacobson and Ilana Glazer face off.

"Dominion" (11 p.m., Syfy): Alex spearheads a plan to intercept Michael and Gabriel; Claire begins the negotiation process with the V1s.

"Graceland" (11 p.m., USA): Paige sets up a bust to pull the plug on the Sarkissian organization.

"Married" (11:30 p.m., FX): Lina tries to be a cool mom; Russ and AJ have a night on the town.