MSNBC has announced Keith Olbermann and NBC News chief White House correspondent David Gregory will anchor coverage of the South Carolina Democratic primary Saturday night. TVNewser reported yesterday that Chris Matthews, who has been co-anchor of political coverage, is committed to emceeing a white tie dinner in Philadelphia Saturday night.

Olbermann and Gregory will anchor live coverage of primary returns beginning at 6pmET, with panelists Joe Scarborough, Eugene Robinson and Pat Buchanan.

Other Saturday programming highlights include:

• 7amET — Morning Joe live from South Carolina
• Noon — Special live edition of Tim Russert
• 1pm-5pm — MSNBC Live with anchors Chris Jansing (1pm & 3pm), Norah O'Donnell (2pm) and David Shuster (4pm)
• 5pmET Re-air of Tim Russert