Key facts
- Graham Platner won the Democratic Senate primary in Maine.
- Platner will challenge incumbent Senator Susan Collins.
- Platner overcame a string of controversies during the election campaign.
Graham Platner has officially secured the Democratic nomination in a key Maine Senate race, setting the stage for a contest against incumbent Susan Collins. Platner pushed past a string of controversies during the election campaign to win the primary. This victory positions Platner as a significant contender in the upcoming election, which could influence the balance of power in the U.S. Senate.