The Supreme Court’s order today letting Virginia purge some 1,600 non-citizens from the voter rolls could go a ways toward allaying jitters over election integrity as November 5 nears. The fact that the dispute had to be addressed by the high court, though, is in itself shocking. Chalk it up to a federal intrusion into state election laws, the so-called “Motor Voter” law, that required states to let people register to vote when they applied for drivers’ licenses.