Immigration and the Fourth of July

In the aftermath of Arizona's new immigration law, with the prospect of other states passing similar crackdowns, President Obama has made an impassioned plea for comprehensive immigration reform, although there's no chance of action before November's elections. Transparently courting the votes of Hispanics, he bashed the Republicans. But he also addressed all sides of an issue that is polarizing the nation. He wants accountability for the federal government's failures, the greed of employers and the lawbreaking by undocumented workers. Will his speech help resolve differences or make them worse?  Will it stop other states from going the way of Arizona?