In 2018, Carpenter won election against independent candidate Shawn Butler by a significant margin, winning a 68.8% majority, despite his opponent raising and spending a much larger amount of campaign funds. Carpenter is a member of the Alaska House Finance Committee. In 2022 Representative Ben Carpenter staunchly opposed and voted against (Senate Bill) SB131 that was to provide additional cancer protections to firefighters in Alaska. In 2019 Carpenter introduced a bill to stop the state of Alaska from reimbursing local municipalities for school bond debt, effectively reducing state funding of public schools by $139 million. In March 2020, Carpenter joined other Republicans of the Alaska House in unsuccessfully opposing Alaska House Bill 221, which would officially recognize the 229 tribes in Alaska that are already recognized at the federal level. In February 2020, during a budget vote in which fellow Republican
David Eastman tried to add amendments eliminating a $5000 line item to be paid to
Planned Parenthood to reimburse it for court fees for an earlier lawsuit against the state of Alaska, Carpenter stood by the award. While noting that he didn't like where the money was going, he asserted the state had lost a case in court which by law required it to make the payment. Like other Republicans in the Alaska House, Carpenter opposes abortion. On all other matters of the day, Carpenter stood with Eastman. In late 2020 and early 2021, Carpenter joined many of his fellow Republicans in their
attempts to overturn the 2020 United States presidential election. He frequently cast doubts on the legitimacy of the election, and posted on his public Facebook page his belief that the election had been corrupt. On December 8, Carpenter, along with some Republican colleagues, urged Governor
Mike Dunleavy to have the state of Alaska join
Texas v. Pennsylvania, a suit seeking to temporarily withhold the certified vote count from four states prior to the Electoral College vote on December 14. Carpenter later posted in support of the
2021 storming of the United States Capitol, making favorable comparisons between the men and women who had stormed the US Capitol and America's decision to join
World War II, saying: ==Comparison of COVID-19 public health measures to Nazi Germany==