I don't see what other state he could've run for. Unlike RFK, who at least had roots in other states (born in NY, lived there until age 12, wife from CT), JFK was inextricably tied to the Bay State. Another idea would be to run for Saltonstall's seat, historically "reserved" for Brahmins. Same as Lodge or Keating: popular, Rocky Republican New England incumbent who's hard to beat. I agree with you on the Presidency.