The
59-year-old Rosenberg served in the House from 1987 to 1991, before
moving to the Senate. He serves as president pro tempore and is point
man on gambling issues for Senate President Therese Murray.
Massachusetts
became the first state to legalize gay marriage in 2004. Rosenberg was
among those who opposed a proposed 2008 constitutional amendment
banning same-sex marriage.
There are at least six gay members of the Legislature.