Top Democratic lawmakers accused a prominent progressive activist of unsavory political tactics while endorsing his opponent on Wednesday, complicating the party’s primary for an Orono-area Maine Senate seat with less than two weeks until Election Day.Abe Furth, co-owner of Orono Brewing Company, is facing activist Mike Tipping in the June 14 primary for the new Maine Senate District 8, which spans roughly two dozen towns in Penobscot County, including Orono and Old Town.