The Arizona law increases penalties against protesters who block access to a political rally. Is blocking access to a political event a political statement in itself? In a Phoenix suburb in March, protesters parked about two-dozen cars in the middle of the highway to stop drivers on their way to an outdoor rally for Donald Trump and Joe Arpaio, the controversial Arizona sheriff. With posters that read "Dump Trump" and "Must Stop Trump," the protesters, in one sense, acted on their right to demonstrate against the Republican frontrunner and the sheriff who was sanctioned for refusing a judge's order to...