This image released NBC, "Today" show co-hosts, from left, Al Roker, Ann Curry, Matt Lauer, Natalie Morales talk with Lisa Kudrow on the "Today" show, Tuesday, June 26, 2012 in New York. Curry got thumped by a “Today” TV camera Tuesday, during a crowd-panning sequence out on Rockefeller Plaza. Curry's face collided with the camera lens on live TV. (AP Photo/NBC, Peter Kramer)

"Today" show co-hosts Ann Curry (left) and Meredith Vieira attend the 2010 Women Who Care Luncheon. Vieira says she is leaving the show next month, and Ann Curry will replace her as host. | The Associated Press

Matt Lauer, Ann Curry,

Ann Curry

"Today Show" host Ann Curry hasn't won over viewers and is expected to leave the long-running morning show.

Meredith Vieira, left, co-host of the NBC "Today" television program, kisses her successor Ann Curry, during her final show, in New York, Wednesday, June 8, 2011. The popular "Today" co-anchor ended her five-year run on Wednesday, telling viewers her decision to go is "right, but it's hard." (AP Photo/Richard Drew)

This image released by NBC shows co-hosts Ann Curry, left, and Matt Lauer, center, with actor Jimmie Walker from the 1970s series "Good Times," on the "Today" show, Tuesday, June 26, 2012 in New York. Walker was promoting his memoir "Dynomite!: Good Times, Bad Times, Our Times." Curry got thumped by a “Today” TV camera Tuesday, during a crowd-panning sequence out on Rockefeller Plaza. Curry's face collided with the camera lens on live TV. (AP Photo/NBC, Peter Kramer)

Meredith Vieira, left, co-host of the NBC "Today" television program, embraces her fellow co-host Matt Lauer as her successor Ann Curry looks on, during her final show, in New York, Wednesday, June 8, 2011. Vieira ended her five-year run on Wednesday, telling viewers her decision to go is "right, but it's hard." (AP Photo/Richard Drew)

Today

Former Alaska Gov. Sarah Palin (right) chimes in during a segment about Tori Spelling’s party-planning tips Tuesday on “Today.” Co-host Ann Curry is at left.

The 16-year ratings dominance of NBC’s “Today,” one of television’s most epic streaks, apparently has ended. The Nielsen Co. said Monday that ABC’s “Good Morning America” beat NBC’s morning show last week by a razor-thin margin of 13,000 viewers.