LOS ANGELES — Following a sustained ratings slide, NBC is shaking up its Sunday morning newsmakers show, “Meet the Press,” by replacing moderator David Gregory with the network's resident political wonk, Chuck Todd.

NBC said Thursday that Gregory, who has been the host of the show for nearly six years, would be exiting the network after 20 years.

“I leave NBC as I came — humbled and grateful,” Gregory said on Twitter. “I love journalism and serving as moderator of 'Meet the Press' was the highest honor there is.”

NBC's Sunday morning public-affairs talk show has the distinction of being television's longest-running program, launching in 1947. Until recently, it was dominant over CBS' “Face the Nation” and ABC's “This Week With George Stephanopoulos,” but as the show lost viewers it also seemed to lose its verve, which prompted rampant speculation that Gregory was vulnerable.

SAN FRANCISCO — San Francisco said goodbye Thursday to Candlestick Park — the stadium where the city's beloved Giants and 49ers celebrated some of their greatest triumphs.The storied venue shut down after an evening concert by former Beatle Paul McCartney that finished about midnight. It will then be demolished to make way for a housing, retail and entertainment development.The Stick, as it is known, opened more than 50 years ago and served as the home field for the 49ers and Giants. It hosted greats from both teams, including Joe Montana, Jerry Rice and Willie Mays, and was the site of The Catch — Montana's pass to Dwight Clark to win the NFC championship game in January 1982 and send the 49ers to their first Super Bowl.