As widely anticipated, Attorney General Eric Holder today filed a lawsuit against Arizona and Gov. Jan Brewer over the state’s immigration law. The suit seeks a preliminary injunction to stop the law from being implemented. The court filing states that Arizona law is pre-empted by federal law and therefore violates the supremacy clause of the U.S. Constitution.The filing makes no assertion that the law is discriminatory or risks being applied in a discriminatory fashion, as the president and other officials said they feared would be the case. Interestingly, this suit makes no civil rights charges against the Arizona law.You can...