A secondary voting proxy that allows a shareholder to override an already submitted vote. When duplicate proxies are received by the corporation, the document with the most timely information will be taken into account.
Taobiz explains Duplicate Proxy
Issuing a duplicate proxy will retract a shareholder's earlier decision. Most firms will provide shareholders with additional proxy forms, allowing them to change their mind when voting on corporate issues. The secondary proxy should be submitted in a timely manner, or risk missing the voting process.