By DAVE ITZKOFF
Jon Stewart, the comedian who made Comedy Central’s “The Daily Show” a nightly home for sharp-edged political satire and up-to-the-moment commentary on the news, said on Tuesday that he planned to leave the program. Mr. Stewart made the announcement on Tuesday’s episode. His departure was confirmed by the channel, which said in a statement, “Jon will remain at the helm of ‘The Daily Show’ until later this year.”