In her Times essay Ravitch very clearly cites four speeches (including a press conference) and four schools, to illustrate her point that «the accounts of miracle schools demand closer scrutiny»: Obama in his 2011 State of the Union praises the Bruce Randolph School in Denver; then, it's Duncan addressing the 20th Anniversary Teach for America celebration last February commending Urban Prep Academy in Chicago; then Bush (and Obama and Duncan) at a Miami High School event in March, before a crowd of adoring high schoolers being extolled for their
progress; finally, Bloomberg
gushing over PS - 33 in New York at a 2005 news conference.