A purge of Indiana’s voter registration rolls is on hold after a federal court order. A law passed last year requires Indiana to cross-check its voter rolls against a multi-state database maintained by the Kansas secretary of state, and weed out any duplicates. That purge was to begin next month. But Common Cause Indiana and the NAACP argue federal law requires a mailed notice and a four-year waiting period — you can’t just summarily cancel someone. Judge Tanya Walton Pratt agreed, blocking the state from implementing the law.