This was for Democrat Delegates & Alternates, hence the need for ID.
Delegate Fees and Applications
Congratulations to all newly elected Delegates and Alternates and Add-ons for the 2012 Massachusetts Democratic State Convention! The registration deadline has passed. The fee has now increased by $25.
Delegates who have paid in advance of the June 2nd Convention will receive their credentials in the mail. If you have not paid prior to Friday, May 18, you will need to register at the MassMutual Center and you will not receive your credentials in advance. The deadline for payment in advance is Friday, May 18, 2012.
Delegates may register by remittance envelopes mailed to the Massachusetts Democratic Party in Boston or online registration.
http://www.massdems.org/2012-state-convention/