The Sierra Club is happy with Maine Independent Senate candidate Angus King, but not everyone is happy with the Sierra Club.

The environmental group announced earlier today that it was endorsing King. The move is not completely conventional. Statistically, the group tends to favor Democratic candidates, but the Sierra Club extensively cited King’s environmental work as governor in its logic for endorsing him.

And the Democrat in that race, state Sen. Cynthia Dill, let her displeasure be known in a press release today.

“In the final analysis, I don’t need environmental endorsements to verify that I am an environmentalist,” she added. “I always have been.”

This is an open-seat race to replace retiring Sen. Olympia Snowe (R). Roll Call rates this race as Likely Independent. Maine Secretary of State Charlie Summers is the Republican nominee.