A once-obscure Democratic state senator from sleepy Ashland, unelected by most voters, has emerged as the most powerful public official in Massachusetts, topping even Gov. Maura Healey in clout and impact. Senate Majority Leader Karen Spilka tells the governor, the House speaker and even the mayor of Boston what to do and right now stands as the biggest obstacle to transparency in the Legislature. Most voters don’t know her and certainly never voted for her, yet Spilka, who represents the 2nd Middlesex/Norfolk District, controls the agenda in the state and how taxpayer money is spent. Spilka was reelected without opposition...