Leslie throws an engagement party for her and Ben, but Ben is panicked about his long divorced parents being in the same room together. Leslie tries to mend old wounds with a unity quilt. As Tom tries to get Ron to invest in his new business he starts to realize he may be outgrowing Jean-Ralphio. Chris is overly emotional due to therapy and Ann tries to keep him from ruining the party.moreless
It's Halloween and things are a little grim for some. Ron and Diane's relationship hits a snag, Jerry suffers a 'fart attack' and Ben's return home gets delayed... indefinitely. The uncertainty of Leslie's future has her worried until she's asked something that totally changes everything.moreless
The sex education classes for seniors run afoul of Pawnee's morality watchdogs when they attempt to teach more than simple abstinence.
As her first official act as a city councilwoman, Leslie proposes a tax on soda to combat Pawnee's rampant obesity, but the restaurants counter by threatening to lay people off if the tax passes and Leslie is torn about how to vote until Ron reminds her of her true nature. Chris and Tom help Andy train for the physical entrance exam into the police academy. Ben and April are still working in Washington D.C., where Ben struggles to gain the respect of the interns on the campaign.moreless
Leslie and Andy travel to Washington, D.C. to visit Ben and April as they work on a congressional campaign. Leslie is intimidated by the national politicos she meets, and feels like her work is unimportant after she is denied a meeting with a senator, however, she gets to meet some of her heroes. Back in Pawnee, Ron throws the annual employee appreciation picnic in Leslie's absence, and it's not quite what people are used to. Ann and Tom fight with each other as they try to hide their breakup from their friends.moreless
Leslie and opponent Bobby Newport hold a debate.
Leslie and Ben begin to worry when Bobby Newport hires a campaign manager from D.C. to run his election bid.
Leslie throws a birthday party for Jerry after everyone had forgotten about his special day. Tom is surprised to learn that he and Ann do not have the same taste in music.
Leslie runs into an old boyfriend when she stops by the police department to ask for an endorsement. Andy recruits Ron and April to record the campaign song.
Leslie Knope (Amy Poehler) has a tough time dealing with negative feedback from the community, and decides to improve her image by hosting a fun-filled evening at a bowling alley. Meanwhile, Leslie's campaign volunteers get into a little unfriendly competition while trying to beat each other's overall campaign fund earnings.moreless
Leslie & Ben compete to see who can make the better campaign ad. Andy & April go to the hospital after Andy hurts his head.
Leslie names Ann her new campaign manager, but things are not off to a good start. Ben picks up a new hobby after his recent job loss. April and Andy adopt a pet.moreless
Following her suspension from the Parks Dept., Leslie forms a citizen action group in hopes of improving Pawnee as a citizen. Ben entertains several job opportunities after his resignation. The rest of the gang searches for the perfect Christmas present for Leslie after years of her thoughtful and fantastic gifts.moreless
Chris tasks Tom and Jerry with redesigning the Parks and Recreation logo while Leslie designs the smallest of parks from the space left behind by public phone booths. Andy decides to start taking classes at community college.moreless
Leslie invites Ben, April, and Andy to host the Pawnee Central High School Model U.N. Ron interviews potential replacements for Tom's job. Chris enlists the help of Donna, Jerry, and Ann regarding his relationship with Jerry's daughter.moreless
April and Andy host a halloween party at the house they share with Ben-without telling him about their plan. In other news, Tom promotes Entertainment 720 while helping out at a campaign event for Leslie.moreless
Leslie creates an all-girl wilderness group to rival Ron's boy only group; meanwhile Tom and Donna try to teach Ben how to relax.
Leslie releases her book about Pawnee, but she hits a snag in the road when Joan claims there is an error which leads to a shocking discovery.
In the fourth season premiere, Leslie struggles with forbidden relationship with Ben as she fears it will jeopardize her future run for office. Meanwhile, Ron has to deal with the arrival of his first wife, Tammy.moreless
Terrorists attack Trent when he is sent home from work.