Democratic Massachusetts Sen. Ed Markey is getting help from some old friends in the environmental movement as he looks to defend his seat from a new primary challenger. Markey got what could be his biggest electoral threat in his five decades in Congress on Wednesday, when Rep. Seth Moulton announced that he’ll run against Markey.

If there was any lesson from then-Representative Joe Kennedy III’s failed primary challenge to Markey, it was this: know why you’re running — and convince the electorate why you’re right.

Democratic Senators Richard Blumenthal and Ed Markey called on the Federal Aviation Administration (FAA) to make public all data and information used to justify the Boeing 737 MAX’s return to service and disclose any internal objections raised by FAA employees.