Biden sees a $35 price cap for insulin as a pivotal campaign issue. It's not that clear-cut

Tommy Marshall, 56, of Atlanta, poses for a portrait on Tuesday, April 16, 2024, in Atlanta. Marshall who has type 1 diabetes, paid $251 dollars for four to eight weeks worth of medication in November. "Even if you can afford it, just paying that much for something that you know is a massive profit center for the drug company is challenging," said Marshall, a lifelong Democrat. He added of Biden, "If I was a his political consultant I'd be telling him to talk about it constantly." (AP Photo/Brynn Anderson)

Rarely a day goes without President Joe Biden mentioning insulin prices.

He promotes a $35 price cap for the medication for Americans on Medicare — in White House speeches, campaign stops and even at non-health care events around the country. His reelection team has flooded swing-state airwaves with ads mentioning it, in English and Spanish.

All that would seemingly add up to a sweeping political and economic impact. The reality is more complicated.