“Rep. Stephen Lynch has defeated a younger, more progressive primary challenger, in the highest-profile test remaining for House incumbents after a turbulent primary season,” NBC News reports.“The 71-year-old incumbent won renomination over Patrick Roath, a 39-year-old former aide to former Massachusetts Gov. Deval Patrick. With his win, Lynch staved off an attempt to add him to the list of Democratic officeholders dethroned by rivals pushing for generational change.”