Had we not seen the old KETV promo, the name of Marcia Ladendorff would have made us think of Tim Conway's "Dorf" character. [Shudder]Several alert readers, however, have reminded us (a) how to spell her name—two Fs, and (b) that she spent time on CNN after leaving the Big O.Armed with the proper spelling, we were able to locate a bio that fills in some gaps. As of a year ago, she was teaching at