A former student shared this with me on what arguments are being used to scuttle the immigration reform: "Jason Richwine is relatively new to the think tank world. He received his PhD in public policy from Harvard in 2009, and joined Heritage after a brief stay at the American Enterprise Institute. Richwine’s doctoral dissertation is titled “IQ and Immigration Policy”; the contents are well summarized in the dissertation abstract: He writes, “No one knows whether Hispanics will ever reach IQ parity with whites, but the prediction that new Hispanic immigrants will have low-IQ children and grandchildren is difficult to argue against.”