Mississippi Gov. Haley Barbour (R) is scheduled to announce his appointee as the interim replacement to resigned Republican Sen. Trent Lott on Monday, according to CQ Politics.
Rep. Roger Wicker (R-MS) "is widely regarded as a leading candidate to be Barbour’s choice, and other GOP figures are thought to be under consideration."
However, one prominent Mississippi Republican-- retiring Rep. Charles W. “Chip” Pickering Jr. -- "took it upon himself Friday afternoon to remove himself from the running for the seat that Lott vacated for personal reasons on Dec. 18."
http://politicalwire.com/archives/2007/12/28/lotts_replacement_will_be_named_monday.html