Sam Stein, Huffington Post, August 25, 2011 Washington - Even before formally entering the Massachusetts Senate race, consumer advocate and Harvard professor Elizabeth Warren has picked up a major union endorsement. The former Obama administration official who spearheaded the creation of the Consumer Financial Protection Bureau, received the unsolicited backing of the Massachusetts Nurses Association (MNA) on Tuesday. The endorsement came before Warren, a Democrat, has said whether or not she will actually challenge Senator Scott Brown (R-MA) for his seat. ... Elizabeth