A Wikipedia article devoted to Critical Race Theory, a controversial legal theory crafted to respond to the alleged role of “white supremacy” in American law, was placed on a temporary editing lockdown over the weekend after bloggers determined that CNN anchor Soledad O’Brien had relied on Wikipedia’s introductory definition of the theory — verbatim — during on an-air debate. A second lock was placed on the article Monday to protect it from politically biased editors who adjusted it following O’Brien’s gaffe. The flurry began after Breitbart.com editor Joel Pollak made a guest appearance on O’Brien’s show to explain a video...