“I willingly drank the Kool-Aid of a man I’ve known since I was 15 years old,” Mr. Wildstein said in a statement he read to the court. “I thoughtlessly followed his hubris and I now must accept the consequences.”

Mr. Wildstein criticized a culture in Trenton, the state capital, that he said was “supervised by a group of former federal prosecutors and career public servants who encouraged the behavior that I now deeply regret.”

It was a point that Judge Susan D. Wigenton emphasized in her sentencing.

“This culminates a sad chapter in the history of New Jersey and it clearly was a culture and environment in the governor’s office that somehow made this outrageous conduct seem acceptable,” Judge Wigenton said, echoing comments she made this year in sentencing Ms. Kelly and Mr. Baroni, both of whom received prison time.

During his trial testimony, Mr. Wildstein, who had described his role at the Port Authority as the governor’s enforcer, portrayed the Christie administration as obsessed with power and revenge. He laid out the way he had orchestrated the plan to close access lanes to the bridge to punish Mayor Mark J. Sokolich of Fort Lee, a Democrat, for refusing to endorse Mr. Christie, a Republican, for re-election, and had then sought the administration’s blessing through Ms. Kelly and had carried it out with Mr. Baroni’s help.

The defense portrayed Mr. Wildstein as a political trickster who relished dirty tactics and deceit that seemed pulled from fictional political thrillers, including stealing the jacket of Frank R. Lautenberg, then a United States senator, before a debate so that Mr. Lautenberg, a Democrat, would have to borrow a coat and be uncomfortable while facing off against Mr. Wildstein’s preferred candidate, Representative Millicent H. Fenwick, a Republican.

Mr. Wildstein was repeatedly described by defense lawyers for Ms. Kelly and Mr. Baroni as “the Bernie Madoff of New Jersey politics,” and he was described even by witnesses for the prosecution as “maniacal” and “a horrible person.”

Following the sentencing, Mr. Christie’s office sent out a blistering statement, attacking Mr. Wildstein’s credibility and integrity.