Op-ed from one of the bill's writers-
Predictably, groups that favor relaxed enforcement of immigration laws, including the American Civil Liberties Union and the Mexican American Legal Defense and Education Fund, insist the law is unconstitutional. Less predictably, President Obama declared it “misguided†and said the Justice Department would take a look.
Presumably, the government lawyers who do so will actually read the law, something its critics don’t seem to have done. The arguments we’ve heard against it either misrepresent its text or are otherwise inaccurate. As someone who helped draft the statute, I will rebut the major criticisms individually:
http://www.nytimes.com/2010/04/29/opinion/29kobach.html
