PORTLAND — Ralph Nader is making what could be its last legal stand seven years after losing his presidential bid.

Nader asked Maine’s supreme court today to reinstate his lawsuit against the Democratic Party and its allies for tactics used to try to keep him off the ballot in Maine and more than a dozen other states. Last November, a Superior Court justice granted a motion by the Democratic National Committee and others to toss his lawsuit.

The appeal focuses on a 1995 Maine statute that targets meritless lawsuits aimed at silencing activists.

The lawsuit contends Democratic leaders conspired to use courts to sabotage Nader and his 2004 running mate, the late Peter Camejo. Ultimately, they appeared on the ballot in 34 states.