Debate: Are teachers unions to blame for failing schools?

I heard this debate on WCBU tonight. It’s from the program “Intelligence Squared U.S.,” which features an Oxford-style debate. There’s a different topic, or “motion,” each week. The motion for this debate was “Don’t Blame Teachers Unions For Our Failing Schools.” Three people spoke in favor of the motion, and three spoke against the motion. Here’s the debate — which side do you think won?