Eleven percent of the class of 2009 applied for positions at Teach for America, a non-profit organization in which students teach for two years in underperforming, low-income school districts. Washington, D.C. public schools chancellor Michelle Rhee ’92 gave a lecture last night in a crowded Bailey Hall about the challenges of managing a public school district — and one that was “the most troubled public school district in the country” when she took office in 2007.