Rep. Thomas Massie lost his primary, and AIPAC openly took credit, raising fresh concerns about foreign lobby influence in US elections.

• Massie blamed AIPAC for backing his opponent, saying there was no real local support for the challenger.
• Minutes after the race was called, AIPAC tweeted that pro-Israel Americans were proud to help defeat him.
• Massie claimed his opponent's main pledge was to bring back the draft to send Americans to fight for Israel.
• Critics say AIPAC is acting as an unregistered foreign lobby openly removing US lawmakers it dislikes.
• Saying the same thing out loud about AIPAC's role could get a regular American fired, while the group itself faces no such limits.

Outlook: Expect more pressure on other lawmakers seen as critical of Israel heading into the next election cycle.