[caption id="attachment_6102" align="alignright" width="270"] MPP Maine political director David Boyer[/caption] Marijuana policy reform advocates in Maine held a press conference in Portland City Hall on Thursday morning to announce the start of a citywide signature drive to make possession of 2.5 ounces of marijuana legal for adults within city limits. The Portland Green Party filed the petition earlier this month and is coordinating the signature drive for the initiative. Major speakers at the…