Joe Biden: If I become president, we'll find the cure for cancer.

Biden speaking at a campaign rally in Otumwa, confessed to the loss of loved ones before making that promise, Periscope broadcasts.

Many of you understand what the loss of loved ones means. I understand if you lose a husband, a wife, a son, a daughter, a family member. That's why I worked so hard in my career to make sure of it. So I promise you that if I'm elected president, you'll see the only more important things that will change America, we'll find cancer medication, Biden said.

This sensitive statement prompted prolonged applause from the audience.

Beden had recently started working on this. He lost his eldest son, Beau Biden, to brain cancer in 2015./ P ERISCOPI/