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The movie kicks off back at the school at the play like the other 2 movies. Harper and her husband walk in and they are just the perfect couple....EXCEPT THEY AREN'T! Her husband just asked for a separation and Harper goes into the bathroom and has a little freak out. The moms hear this and come to check on her, the rest is love club history. 
Fast forward a year and the separation is in full swing. Her husband asks for a divorce. She pushes back and that's when he tells her that he's found someone. Sounds like a job for THE LOVE CLUB...MOMS! 
Harper is busy busy, planning a big ambassador night at the school. But when she finds out that councilman Colin is having a big gathering at the same time, Harper gets mad an tells him off. He attempts to team up with her when he finds out how active she is in the community but she's not having it. But when Tori tells her she's blowing an opportunity to have real influence in the community, she goes to talk to him and give him another chance. He makes sure to mention that he's a divorced single dad. They have so much in common! Things are beginning to go great. Jo even tries to set them up for a lunch date. But when he takes credit for an initiative that was her idea, she gets mad and decides to run against him! Only problem is they're 10 days away from the election. Early on, she thinks she needs to hide the fact that she's getting a divorce. But she decides to come clean and run her campaign honestly. 
They find out that the city is going to build on a beloved park's land. So they decide to work together to shut it down. They even chain themselves to a tree to stop from a tree getting cut down. They mayor ends up saving the park but gives Colin the credit. This makes her mad. She ends up winning the election! He takes the moment to shoot his shot and they kiss and now they're a power couple!