Graham Platner has Democrats wondering if they need an outsider to win the White House

Graham Platner, a populist Democratic candidate, has shaken up his party's establishment with his rise to prominence, prompting Democrats to wonder if an outsider is needed to win the White House. His primary competitor, Maine Gov. Janet Mills, suspended her Senate campaign amid polls showing she was trailing Platner. Platner's unexpected success has garnered a national following in the party.