Many new laws were passed recently regarding what identification you will need to bring to the polls. What is considered acceptable identification varies among states. Some states do not require ID documents at the polls as all and rely on a matching signature.
To find your local elections office's information, go to the Election Official Directory. Choose your state and region to find the contact and address of your local election official or click on the link to the Local Elections Website to get more information about your state's ID requirement.