At the big Oprah-headlined rally for Barack Obama in Los Angeles on Saturday, surprise guest Maria Shriver, California's First Lady, cited -- as one of a string of reasons why the state's Democrats should vote for the Senator from Illinois -- the fact that, like California, he was "diverse." In the wake of Super Tuesday, we've learned that such diversity doesn't necessarily include Latinos, especially those older than 30. But a self-congratulatory article in the India Express touting the influence of Indian-Americans in the Democratic primary process reveals even greater constraints on the appeal of Obama's diversity. In California, exit...