PORTLAND, Maine — Maine Governor Janet Mills is favored by 10 percentage points among self-described likely Democratic primary voters over Graham Platner, according to a new statewide poll released on Wednesday.

But both Mills and Platner are in a dead heat with the incumbent Republican they each hope to face next year, Republican Susan Collins.

Among likely Democratic primary voters, Mills leads Platner 47% to 37% , with 15% undecided or preferring another candidate, according to a Pan Atlantic Research poll .

In a hypothetical matchup, Mills and Collins each polled 43% of voters with 14% undecided.

Platner did a bit better, polling 43% to 42% over Collins with 15% undecided.

In the Democratic Senate race, Mills is favored by women, 56% to 37% over Platner, and by men, 42% to 35%

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