The question of who can replace Jon Stewart on "The Daily Show" seems roughly akin to asking his fans what might stand in for the sun.

His passion, wit and boldness make for a magical combination that will be difficult to re-create when he steps away later this year.

"The X-factor here is Stewart's charisma. It's significant," said Sophia McClennen, author of "Is Satire Saving our Nation? Mockery and American Politics."

The "Daily Show" boot camp has graduated a number of impressive talents, McClennen said, counting John Oliver first among a group including Aasif Mandvi, Samantha Bee and Jason Jones.

Other candidates include Tina Fey or Amy Poehler. Chris Rock is brilliantly funny, certainly fearless. Seth MacFarlane is a writer, performer and singer who can summon the juvenile glee that Stewart employs.

Joel McHale is quick-witted, lovable and has a following that encompasses the frat-boy demo that is undeniably part of the "Daily Show" fan base.

CBS' Bob Simon killed in crash

Longtime "60 Minutes" correspondent, who covered riots, Academy Award-nominated movies and wars and was held captive for more than a month in Iraq two decades ago, died in a car crash on Wednesday. He was 73.

"CBS Evening News" anchor Scott Pelley, his eyes red, announced the death in a special report. "We have some sad news from within our CBS News family," Pelley said. "Our colleague Bob Simon was killed this evening." A town car in which Simon was a passenger hit another car stopped at a Manhattan traffic light and then slammed into metal barriers separating traffic lanes, police said. Simon and the town car's driver were taken to a hospital, where Simon was pronounced dead.

Simon, who was in his 19th season as a correspondent for "60 Minutes," won 27 Emmy Awards — perhaps the most held by a journalist for field reporting, CBS said. He also worked in CBS' Tel Aviv bureau from 1977 to 1981 and in Washington, D.C., as its Department of State correspondent.

Simon's career in war reporting began in Vietnam, and he was on one of the last helicopters out of Saigon when the U.S. withdrew in 1975. At the outset of the Gulf War in January 1991, he was captured by Iraqi forces near the Saudi-Kuwaiti border. CBS said he and three other members of CBS News' coverage team spent 40 days in Iraqi prisons. He also covered conflicts in Northern Ireland and Portugal, as well as U.S. military actions in Grenada, Somalia and Haiti.

His latest contribution to "60 Minutes" aired over the weekend and was an interview with Ava DuVernay, the director of "Selma."

Simon was born May 29, 1941, in the Bronx. He graduated from Brandeis University in 1962 with a degree in history. He and his wife have a daughter, who is a producer for "60 Minutes" in New York.

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