In the season finale, the state senate election comes around and Bill and Marilyn work on last minute arrangements. A scandal in Kansas makes the Henrickson family rethink their plan about coming clean with their polygamy.
Bill worries about Marilyn's plan that might jeopardize his political career. Barb draws the wrong kind of attention at an all-ladies event. Sarah's plans for the future shocks her family.
Bill and Joey head to Mexico to rescue Lois and Frank. Margene tries to stop Ana from leaving the country. Barb and Tommy come across a surprising event at the casino.
Bill wants more exposure for the casino. Ben and Jodean are further involved in Lois and Frank's bird enterprise. Ana shows back up at the Henricksons with some startling news.
Bill continues to work on his campaign as Nicki throws herself into helping out. Bill worries Colburn as he wants to take down Bill. Frank pays a visit to the reservation.
An audit of Home Plus brings a few surprises and threatens Bill's potential political career. JJ wants a policy change at Juniper Creek and Bill finds out something revealing about Margene and Ben.
Bill heads to Washington, D.C. to obtain support for his run for Utah State Senate but ends up on opposing side of a lobbyist. Elsewhere, Alby deals with his father's legacy all the while becoming attached to Dale.
Bill considers running for Utah State Senate, but Nicki, Margene and Barb all have different feelings about it. Meanwhile, Sara and Scott decide that they will get married, but not sealed under the church.
In the fourth season premiere, the Henricksons plan to open their Indian reservation casino. Elsewhere, the FBI launches an investigation to find Roman Grant and Nikki tries to keep her daughter away from J.J.