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Even worse for NBC, a significant number of viewers appear to blame co-host Matt Lauer for the move. The network consistently has denied tabloid reports that Mr. Lauer was unhappy with Ms. Curry. “Today” Executive producer Jim Bell said late last month that Mr. Lauer was being treated unfairly. Firing Ms. Curry was Mr. Bell’s decision, he said.

Some awkward public moments haven’t helped. When Ms. Curry reappeared on “Today” during the London Olympics to introduce a story she had done, Mr. Lauer twice remarked that it was good to see her again. Ms. Curry didn’t return the sentiment to the man she worked with for 15 years.

Two years ago, Mr. Lauer’s positive “Q” score was 23 — meaning 23 percent of people who knew him considered Mr. Lauer one of their favorite broadcasters, according to Marketing Evaluations Inc., a company that measures public sentiment toward well-known personalities. Now his positive score is 14. At the same time, “Good Morning America” co-host Robin Roberts’ positive “Q” score jumped from 20 to 27.

Ms. Langelier felt there was a perception that Mr. Lauer was “king” and others on the show aren’t equal to him. Lyle Nelson, 40, a salesman from Avondale, Ariz., said Mr. Lauer was “not someone I’d like to have a beer with.”

Fortunately for NBC, viewers don’t seem to be taking out their unhappiness on Ms. Guthrie.

Producers often say that viewing decisions for morning television can be intensely personal, since people are essentially inviting these personalities into their homes at an intimate time of day when they were getting ready for work. Feeling a part of the TV “family” they see on air is part of it, and sometimes the reasoning seems strange. Mr. Nelson said, for example, that he didn’t like the couch on “Today” because it looked uncomfortable.

“In today’s doom and gloom news programs, the 'Today' show gave me a lift to get my day started,” said Taren Robin, 48, from Paris, Ky. “I don’t get that lift anymore, and I am in mourning over the fact. I haven’t found anything I like better to take its place.”

At least one-third of people who responded to a Twitter request to discuss the show cited its content for their discontent.

“I used to be a regular 'Today' show viewer but got tired of their formula,” said Dan Laufer, 35, a sports marketer from the District. “Five minutes of hard news followed by an animal rescue story, the Kardashians and then pop culture or fashion. It’s OK with me — in moderation.”

Joan Pierce is a 64-year-old retired nurse from Oklahoma City, Okla., who watched “Today” for 40 years. Now she says: “I don’t care what Lindsay Lohan does.”

Biting as they may be, at least those complaints offer “Today” the seeds of potential recovery. “Good Morning America,” particularly in its second hour, has an even greater pop-culture emphasis. Mr. Bell said his show will try to draw a greater contrast with its ABC rival in coming months.

A recent ad with Mr. Lauer touts the “informative” nature of the show. Ms. Curry, who has kept her job with NBC as a hard news reporter, appeared on “Today” during the past month interviewing Libyan President Mohammed Magarief and reporting from Syria.

CBS has already tried to position itself as a newsier alternative in the morning. Because “Today” has a richer history and often twice as many viewers, it would be in better position to reach people who want this.