Bill Clinton weighed in on the debate over charter schools this week, warning that the publicly funded yet autonomous schools must keep their “original bargain” if they want support as alternatives to traditional public schools.

The Huffington Post reports that in remarks before a dinner hosted by the Clinton Global Initiative on Tuesday, the former president hailed the potential of charter schools, even as he called on them to be held to high standards. Clinton cited New Orleans, whose post-Katrina public schools are 100 percent charter. While casting New Orleans’ experience with charters as a success story, he added an important caveat. Charter schools aren’t worth supporting, Clinton suggested, unless they perform better than traditional public schools.

“They still haven’t done what no state has really done adequately,” Clinton told the group, “which is to set up a review system to keep the original bargain of charter schools, which was if they weren’t outperforming the public model, they weren’t supposed to get their charter renewed.”

Clinton’s statement is stunning once you consider its implications. Research shows that the vast majority of charter schools in the U.S. haven’t cleared that hurdle. A study at Stanford University last year found that only 25 percent of charter schools fare better than traditional schools in reading. In math, only 29 percent of charters do better. Nineteen percent of charters actually did worse in reading, while 31 percent were worse in math; the rest weren’t significantly different from traditional public schools.

While Democratic Party centrists in Clinton’s mold have been some of the most enthusiastic cheerleaders for charter schools, Clinton’s comments come as many within the Democratic Party are pushing back against so-called education reformers who want to dismantle teacher protections and increase the number of charter schools. In response to the rise of such groups as Campbell Brown’s Partnership for Educational Justice (chaired by Democratic trial lawyer David Boies) and Democrats for Education Reform, Democrats including operative Donna Brazile, former Ohio Gov. Ted Strickland and former Michigan Gov. Jennifer Granholm this summer formed Democrats for Public Education. The group’s launch underscored that while many of the party’s financial backers support an anti-union, pro-charter agenda, the “reform” movement’s actions are starting to trigger a powerful reaction within the party.

Let’s be clear here. This isn’t about Bill Clinton having an epiphanies.

Bill Clinton isn’t the sort of guy who has epiphanies.

He is a very smart guy who surveys the terrain, and chooses a path, and chooses the best possible path forward for him.

What’s more, Clinton has a record of being just far enough ahead of the curve on these sort of trends to win politically.

My guess, (hope) is that the increasingly dubious claims of the charter school industry, will gain currency in the next year or so, and this is what Clinton has picked up on:

But the word is out, and resistance to charter takeovers is stiffening in more places than York. In school systems such as Philadelphia, Bridgeport, Pittsburgh, and Chicago, where charter schools are major providers, parents and local officials have increasingly opposed charter takeovers of their neighborhood schools. A recent poll in Michigan, where the majority of charter operations are for-profit, found that 73 percent of voters want a moratorium on opening any new charter schools until the state department of education and the state legislature conduct a full review of the charter school system.

I so hope that I’m not being a Pollyanna here,