Not the same article, but the info is also in the Fordham Report: http://www.edexcellence.net/doc/20080618_high_achievers.pdf

Originally Posted by Fordham Report
Low-income, black, and Hispanic high achievers (on
the 2005 eighth-grade math NAEP) were more likely
than low achievers to be taught by experienced
teachers. These disadvantaged high achievers�
termed �NCLB-HA� in the study�were also as likely as
other high-achieving students to have teachers who
had majored or minored in math. - page 4