Commenting on the Congress-DMK combine, Chidambaram said his party would be happy if more parties join them. “It is a cause of concern that the Election Commission is still ignoring irregularities committed during the RK Nagar by-poll,” he said, adding that it showed that the poll watch body was inactive. It is for this reason, Chidambaram said, the Congress party had been demanding to bring back the ballot paper system.