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Obama wants more accountability for teachers. The teachers unions contend that there is no universal metric that can reliably assess teacher performance, particularly in poor neighborhoods where students experience intense social dislocation. Part of the problem is that nothing seems to work: not charter schools, not tying teachers to student performance, not throwing money at schools, not even curricula reform. There are blips -- a voucher program works here, a charter school works there. Nothing seems to work everywhere. Performance measured in the short term doesn't tell people much about anything, but people grab on to numbers, and the government rewards states who show progress on the numbers, so... states do everything they can to get their numbers up.