Incumbent Sen. Ed Markey, an 80-year-old progressive, staved off a primary challenge by 47-year-old moderate Rep. Seth Moulton in the Massachusetts Democratic Senate primary. ▻ ↧ Massachusetts Sen. Ed Markey will defeat challenger Rep. Seth Moult... Markey, an 80-year-old progressive, staved off a challenge by Rep. Seth Moulton, a 47-year-old member of the moderate New Democrat Coalition.