They said they were pleased to keep "The Abrams Report," the program that had been holding Mr. Ventura's expected spot, in the weekday prime-time lineup.
Still, Mr. Sorenson said the decision was easy because the audience for "The Abrams Report" was exceeding expectations.
The show was a revamped version of Abrams' previous show on MSNBC in 2001 The Abrams Report.
The Abrams Report was an American television program on MSNBC, focusing on legal and tabloid issues.
Mr. Moore, 29, is a producer for "The Abrams Report," a daily news program about the law on MSNBC.
Daniels was also a daytime anchor on MSNBC Live and a regular substitute host on The Abrams Report.
Erik Sorenson, the president of MSNBC, said in the memorandum to his staff that he was moving "The Abrams Report" to 6 p.m..
The Abrams Report on MSNBC, meanwhile, drew 215,000 viewers to its weekday hourlong show about legal issues.
Abrams then began hosting his own show at MSNBC, and The Abrams Report began in 2001.
Abrams hosted The Abrams Report until he accepted the lead managerial position at MSNBC.