Common Cause Massachusetts Executive Director Pam Wilmot said that while she believes mailing ballots to all would be the "most efficient system," she recognizes the barriers to setting it up in time this year.

"We've heretofore done very little voting by mail, and the sort of transition to a full mail system is something that typically takes many, many years," she said. "We certainly are pushing for this reform in many places, but politics is the art of the possible."