The Supreme Court stepped into the fight Monday over a tough Arizona law that requires local police to help enforce federal immigration laws, pushing the court deeper into partisan issues of the 2012 election campaign. The case is the court's biggest foray into immigration law in decades, said Peter Spiro, a professor at Temple's Beasley School of Law. Spiro said the court easily could have passed on the Arizona case for now: "They could have waited for the more extreme case to come from Alabama, which really outflanked the Arizona law."