The candidates interrupted Lehrer three times as often as Obama and Sen. John McCain did during their first presidential debate of 2008
Debate moderator Jim Lehrer says it's not important if he got stepped on by Barack Obama and Mitt Romney
Jim Lehrer and Bob Schieffer will also moderate debates
Bo Jones Jr. will be the President and CEO of MacNeil/Lehrer Productions
Public television fixture to leave daily news show after 36 years in June
PBS changing show's format to preserve it.
Hiring of CBS News' Hari Sreenivasan is part of plan to merge show's broadcast, online divisions.