school chancellor michelle rhee.mike lurie tells us about his decision not to run and why he thinks it's best for the city of sacramento. >> i love sacramento. >> reporter: after seven years in office kevin johnson announced he will not run for re-election next year. >> when i had to think about making this important decision, let me just say it was a very difficult one. i had to soul search. i talked to my family. i talked to my friend, and at the end of the day i felt that i wanted to make a decision that was in the best interest of sacramento. johnson was instrumental in keeping the kings in sacramento and the former phoenix suns all-star point guard has been on the defensive lately se lly setf old allegations of sexual misconduct with a girl in phoenix years ago. prompting espn -- >> it didn't impact my decision then and it doesn't impact my decision again. why is the mayor not running again in the campaign manager was on the phone late last night and offered this perspective today. >> the biggest champion for ru

followed michelle rhee in washington, d.c. for three years. >> i'm terminating your principalship now. >> i think when you're doing the kind of work i'm doing in public education, where the lives and futurees of children hang in the balance, you cannot-- you can't-- you can't play with that. >> she became the face of a kind of what you'd call "test-based accountability," which is using test scores to judge teachers. most countries use test scores to judge students, and tests are designed to measure what students are doing. but we, i think alone among advanced countries, use them to fire or hire or evaluate teachers. >> woodruff: i think the question a lot of people would like to ask you, john merrow, given all the time you've spent looking at our schools is, is are they as bad as the worst critics say they are? >> no. >> woodruff: or are they as good as some of their fierce defenders say they are? >> judy, i would say probably a third of our schools are better than schools have ever been in this country. but that creates a rea