The state Board of Elections was too damn polite.

And unsuccessful gubernatorial candidate Jimmy McMillan is so damn upset about it, he’s suing the board for $350 million.

The founder of “The Rent is Too Damn High Party” is outraged that in 2006, when he ran for governor, and three years later, when he ran for mayor, the board took the world “Damn” off his ballot line.

“It’s a violation of constitutional rights,” McMillan told The Post yesterday at the Brooklyn federal courthouse.

Acting as his own attorney, McMillan insisted he’s undeterred that a judge tossed an earlier, $50 million suit.

“We know we’re going to win,” he said.

“I’m filing the appeal papers now,” he said, brandishing a sheaf of legal filing.

“I want the Board of Elections to pay for the years that they stripped us from the ballot — to pay us money damages,” he said.

“They really broke our party up.”

The state agency said it took the action not because its delicate sensibilities were offended.

The name was simply too long, an official said.

State law requires party titles be uniformly printed, the official said, and placing the full name of McMillan’s party on ballots would require its typeface to be too small.

Even though the board contends his lawsuit has no merit, it did manage to find a way to try to appease him in the last election.

His party name on the Nov. 2 gubernatorial ballot was condensed to “Rent is 2 Damn High Party.”

McMillan — still looking very much like a candidate as he strode into the courthouse wearing a carefully tailored navy blue suit, his sideburns bristling and his silver hair immaculately coifed — had even more to vent about.

He’s disappointed with President Obama.

He said he invited the commander-in-chief to New York to discuss the nation’s economic problems and go on a walking tour featuring foreclosed homes.

“He didn’t show,” McMillan said.

Obama’s only response, he said, was an impersonal form letter printed on White House stationery.

The snub prompted McMillan to issue an ultimatum.

“I’m going to give him one more chance,” he said.

“I’m going to send a letter off this week. If he doesn’t respond to that letter, then I’m going to run for president of the United States of America.

“I may run on my party line or I may run as a Democrat,” McMillan said with a grin.

“I have the supporters. The heat is on.”