A major player in health insurance is resisting a bipartisan Medicare bill that would hurt the company’s bottom line. That’s to be expected. Here’s the odd part: The insurance giant is AARP.

AARP, formerly the American Association of Retired Persons, is most famous for its $16-a-year membership card that gets you discounts everywhere from the movie theater to the pharmacy. In Washington, AARP is known as the powerful seniors lobby — the organization has reported just under $200 million in lobbying expenses over the past 10 years.