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Following the death of Rep. LaWanna “Lou” Shurtliff on December 30, 2020, Democratic delegates in [[Michigan's 10th congressional district|House District 10]] recommended Lesser for appointment; Governor [[Spencer Cox]] appointed her on January 16, 2021, and she took office during the 2021 general session.[{{cite web |title=Weber County Democrats recommend Rosemary Lesser for Utah House |url=https://news.ballotpedia.org/2021/01/21/weber-county-democrats-recommend-rosemary-lesser-for-utah-house/ |website=Ballotpedia News |date=January 21, 2021 |access-date=October 23, 2025}}][{{cite news |last=Johnson |first=Tim |title=State Rep. Rosemary Lesser, ]Utah’s newest lawmaker, adjusting to new role |url=https://www.standard.net/news/government/2021/jan/31/state-rep-rosemary-lesser-utahs-newest-lawmaker-adjusting-to-new-role/ |work=Standard-Examiner |date=January 31, 2021 |access-date=October 23, 2025}} |
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Following the death of Rep. LaWanna “Lou” Shurtliff on December 30, 2020, Democratic delegates in [[Michigan's 10th congressional district|House District 10]] recommended Lesser for appointment; Governor [[Spencer Cox]] appointed her on January 16, 2021, and she took office during the 2021 general session.[{{cite web |title=Weber County Democrats recommend Rosemary Lesser for Utah House |url=https://news.ballotpedia.org/2021/01/21/weber-county-democrats-recommend-rosemary-lesser-for-utah-house/ |website=Ballotpedia News |date=January 21, 2021 |access-date=October 23, 2025}}][{{cite news |last=Johnson |first=Tim |title=State Rep. Rosemary Lesser, Utah's newest lawmaker, adjusting to new role |url=https://www.standard.net/news/government/2021/jan/31/state-rep-rosemary-lesser-utahs-newest-lawmaker-adjusting-to-new-role/ |work=Standard-Examiner |date=January 31, 2021 |access-date=October 23, 2025}}] |
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In the [[2022 Utah House of Representatives election|2022 general election]] she defeated Republican nominee Jill Koford with 52.3% of the vote (5,771 to 5,271).[{{cite web |title=Utah House of Representatives District 10 — 2022 election results |url=https://ballotpedia.org/Utah_House_of_Representatives_District_10_candidate_surveys%2C_2022 |website=Ballotpedia |access-date=October 23, 2025 |quote=Incumbent Rosemary Lesser defeated Jill Koford … Lesser 52.3% (5,771)] ; Koford 47.7% (5,271).}} |
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In the [[2022 Utah House of Representatives election|2022 general election]] she defeated Republican nominee Jill Koford with 52.3% of the vote (5,771 to 5,271).[{{cite web |title=Utah House of Representatives District 10 — 2022 election results |url=https://ballotpedia.org/Utah_House_of_Representatives_District_10_candidate_surveys%2C_2022 |website=Ballotpedia |access-date=October 23, 2025 |quote=Incumbent Rosemary Lesser defeated Jill Koford … Lesser 52.3% (5,771); Koford 47.7% (5,271).}}] |
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In [[2024 Utah House of Representatives election|2024]], Koford narrowly defeated Lesser in one of the state’s closest House races; canvassed county results certified Koford’s win and flipped the Weber County–based seat to Republicans.[{{cite news |last=Vandenack |first=Tim |title=Jill Koford wins District 10 Utah House seat, flips seat to Republicans on second try |url=https://www.ksl.com/article/51193563/jill-koford-wins-district-10-utah-house-seat-flips-seat-to-republicans-on-second-try |work=KSL.com |date=November 20, 2024 |access-date=October 23, 2025}}][{{cite news |last=Vandenack |first=Tim |title=Jill Koford wins District 10 Utah House seat, flips seat to Republicans |url=https://www.deseret.com/utah/2024/11/20/jill-koford-wins-district-10-utah-house-seat/ |work=Deseret News |date=November 20, 2024 |access-date=October 23, 2025}}][{{cite news |title=Republican Jill Koford wins House District 10 as Weber County certifies election results |url=https://www.standard.net/news/government/2024/nov/19/republican-jill-koford-wins-house-district-10-as-weber-county-certifies-election-results/ |work=Standard-Examiner |date=November 19, 2024 |access-date=October 23, 2025}}] |
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In [[2024 Utah House of Representatives election|2024]], Koford narrowly defeated Lesser in one of the state’s closest House races; canvassed county results certified Koford’s win and flipped the Weber County–based seat to Republicans.[{{cite news |last=Vandenack |first=Tim |title=Jill Koford wins District 10 Utah House seat, flips seat to Republicans on second try |url=https://www.ksl.com/article/51193563/jill-koford-wins-district-10-utah-house-seat-flips-seat-to-republicans-on-second-try |work=KSL.com |date=November 20, 2024 |access-date=October 23, 2025}}][{{cite news |last=Vandenack |first=Tim |title=Jill Koford wins District 10 Utah House seat, flips seat to Republicans |url=https://www.deseret.com/utah/2024/11/20/jill-koford-wins-district-10-utah-house-seat/ |work=Deseret News |date=November 20, 2024 |access-date=October 23, 2025}}][{{cite news |title=Republican Jill Koford wins House District 10 as Weber County certifies election results |url=https://www.standard.net/news/government/2024/nov/19/republican-jill-koford-wins-house-district-10-as-weber-county-certifies-election-results/ |work=Standard-Examiner |date=November 19, 2024 |access-date=October 23, 2025}}] |