Troy Jackson has moved into a stronger position to become the Democratic candidate for Maine's U.S. Senate race, after several opponents exited the contest on Sunday. The shift reshaped the field and increased Jackson's momentum as Democrats look for a replacement for Graham Platner.

Jackson, a former state legislator, had been competing in a multi-candidate Democratic lineup. With the departures of other contenders, the race appears to have narrowed significantly around his candidacy.

Before the latest changes, the campaign had included a televised debate featuring candidates including Shenna Bellows, Jackson, Dr. Nirav Shah and Jordan Wood. The event highlighted the crowded nature of the contest before the withdrawals altered the dynamics.

The latest developments leave Jackson in a much stronger spot as Maine Democrats sort out their Senate nominee. With fewer rivals in the race, attention is likely to center more directly on his campaign and what comes next for the party's effort in the state.