Why Isn't the Obama Administration Suing 'Sanctuary Cities'?

The Weekly Standard reports:

The Justice Department is preparing a lawsuit against Arizona’s controversial immigration law, likely to be filed next week. Secretary of State Hillary Clinton told a South American interviewer last week that the Obama administration opposes the law because “the federal government should be determining immigration policy.” The idea that the administration seeks to uphold federal sovereignty in matters pertaining to immigration is hard to swallow.

U.S. law prohibits public universities from providing in-state tuition rates for illegal immigrant students, yet ten states currently allow undocumented students to pay in-state tuition. Numerous “sanctuary cities” deliberately subvert federal immigration policy by preventing local law enforcement and other officials from inquiring as to the immigration status of residents. Some have gone even further by providing undocumented immigrants with local forms of identification.