but I have been wondering why did Kennedy challenge Markey?

If Kennedy has shown any initiative in Massachusetts’ 4th congressional district in the 4 terms since he succeeded Barney Frank, I (a resident of that district) am unaware of it. Indeed if he had done anything noteworthy, wouldn’t it have shown up in his current tv spots?

In my view Kennedy feels - because one of his great uncles was the President of the U S over a half century ago, another great uncle was a notable and long term Massachusetts Senator, and his grand father was the US Attorney General and a New York senator - that he is “entitled” to the senate seat. (My guess is he views this senate seat as mere stepping stone to the White House.)

living in MA. I've met Joe Kennedy and heard him speak. I like both of them but if I were still there Markey would have my vote.

I like AOC's comments about age & I like that Markey isn't afraid of a younger member of Congress.