tough. unrelenting. his enemies called him rahmbo. >> you're known as a volatile guy, a bit of a roman candle with a temper. what is the angriest you've gotten in the first 100 days? >> that i had to do this interview right in the middle of everything else i need to do. i swam this morning a mile. yesterday i swam a mile, biked four, weights, and then a yoga class. neurotic is actually a fair word about it. obsessive. obsessive about it. >> obsessive. that about sums up all things rahm emanuel, especially his commitment to shake up chicago's failing public schools. >> there's 400,000 kids that go to our schools. we have the capacity for 500,000. certain schools that were 200 kids when they were able to handle 600. >> chicago's public school system faces a $1 billion budget gap. the mayor's hand-picked school board is proposing to close underutilized schools, mostly in african american and latino neighborhoods where the population has dropped. >> very difficult decision.