A bill that would require voters who show up at the polls without identification to cast provisional ballots is headed to the House floor after being lambasted by Democrats in a committee hearing Friday. On a 16-6 vote, the Committee on Privileges and Elections advanced House Bill 9, sponsored by Del. Mark L. Cole, R-Spotsylvania, the committee’s chairman. The legislation would alter existing law, which allows anyone who claims to be a registered voter to cast a regular ballot, even without proper identification. All but one Democrat on the committee, Del. Johnny S. Joannou, D-Portsmouth, opposed the change, claiming it could suppress the votes of minorities as well as the elderly, the young and the poor. “There’s no way humanly possible that I can support this bill,” said Del. Algie T. Howell Jr., D-Norfolk. “I don’t know why we have this bill in front of us if we don’t have documented cases of voter fraud or problems at the polling place,” added Del. Kenneth C. Alexander, D-Norfolk.