CBS News is changing up the final week of “The Early Show.” On Monday and Tuesday Bob Schieffer and Norah O’Donnell will co-anchor from Des Moines, Iowa ahead of the first votes of the 2012 presidential primary. Next Friday’s show will be the last for “Early” which debuted Nov. 1, 1999, with Bryant Gumbel and Jane Clayson as co-anchors. On Monday, January 9, the new “CBS This Morning” with Charlie Rose, Gayle King and Erica Hill will launch.