Markey, Moulton lock horns ahead of Massachusetts Senate primary: 3 takeaways from last debate

Rep. Seth Moulton and Sen. Ed Markey exchanged blows from the onset of the final Massachusetts Democratic Senate primary debate as the 47-year-old House lawmaker mounts a longshot bid to oust his 80-year-old progressive opponent.  Moulton and Markey appeared for their last televised debate on Thursday, which was hosted by WCVB-TV, WBUR-FM and The Boston…