He's sourcing ONE major national assessment available at the time in 2009 that had valid criticisms levied against it:
"The Stanford center’s finding that more charter schools underperform their peers than outperform them “flies in the face of what we know,” said Jeanne Allen, founder of the Center for Education Reform, a pro-charter group, who called the study “flawed.”
There was also, according to Stanford University economist Caroline Hoxby, a subtle statistical problem with the approach, stemming from the use of researchers of more than one matching student from conventional schools. This would tend to bias the results against charters, Hoxby said, although it isn’t clear whether the effect would be significant. “This was a pretty embarrassing mistake because it was pretty elementary,” she said. She added of Raymond’s group, “I overestimated how much econometrics they knew.”
http://blogs.wsj.com/numbersguy/the-conflicting-charter-school-numbers-1014/
Here's a more recent study that collates much more data from various, multiple sources. There's a PDF at the bottom.
http://news.heartland.org/newspaper-article/2011/11/16/study-charters-outperform-public-schools
It is also absolutely NOT true that ALL parents who enroll at a charter have invested in their kids, particularly at the lottery schools. I used to work with the kindergarten and first-grade kids on their at-school work packets. Some of those kids were woefully ill-prepared and detracted from the experience of the entire class. I was astounded. I'm sure it's the same at public school. Nonetheless, most of the teachers I've witnessed at the charter do a reasonably good job of whipping kids into shape. No bullshit, no tolerance. Just as it should be. And the best get results and should be paid significantly more.
However, I think we can all agree that the kids with piss-poor parents tend to anchor the class, impacting the average and weighing down a kid like my own, who's ready to take off. No kid let ahead. Story of America, a story of moral decline and depravity, the demand for equality of outcomes rather than opportunity, and a lack of willingness to adapt to a rapidly evolving global economy because it "hurts" to compete.