Kansas county election offices are sorting through thousands of records to identify voters affected by a recent federal court order, according to Secretary of State Kris Kobach. The U.S. Court of Appeals for the D.C. Circuit blocked Kansas and two other states from requiring proof of citizenship from people who register to vote using the federal form. Kobach said the state’s voter database does not differentiate between people who register with the federal form and the state form, so local election officers will have to physically go through paper records of people who tried to register since January to determine which voters were affected by the ruling. He estimated the number of people affected would be between 200 and 400 statewide. The state began requiring voters to provide proof of citizenship, such as a birth certificate or passport, when they register to vote in 2013. Before this year, federal form registrants were allowed to cast ballots in federal elections regardless of whether they provided proof of citizenship.