- Mike Crapo (R-ID) is a five-term Idaho senator first elected in 1998, the longest-serving Republican senator from Idaho and chair of the Senate Finance Committee — one of the most powerful committee positions in Congress.
- Idaho is R+25 — one of the most Republican states, and Crapo faces no serious re-election threat, winning his last race by 37 points in a state where Democrats rarely compete at the statewide level.
- As Finance Committee Chair, Crapo oversees tax legislation, trade agreements, Social Security, Medicare, and Medicaid — a sweeping jurisdiction that makes him one of the most consequential senators for economic policy in 2025-26.
- He is known for working across the aisle on financial regulation — co-authoring the Crapo-Warner banking deregulation bill in 2018 and participating in bipartisan healthcare finance negotiations — despite representing one of the most conservative states.
Biography
Michael Dean Crapo was born on May 20, 1951, in Idaho Falls, Idaho. He attended Brigham Young University and then Harvard Law School, returning to Idaho to practice law. He entered politics in 1982, winning a seat in the Idaho State Senate, where he served until 1990. He was then elected to the U.S. House of Representatives from Idaho's 2nd congressional district, serving four terms from 1991 to 1999. In 1998, he won the Senate majority being vacated by Republican Dirk Kempthorne, who was running for governor, defeating Democrat Bill Mauk by 40 percentage points.
Crapo has been re-elected multiple times with comfortable margins reflecting Idaho's deep conservatism at the federal level. The state has not sent a Democrat to the Senate since Frank Church in 1974. Crapo has compiled a consistently conservative voting record across his nearly three decades in the Senate while accumulating the kind of institutional seniority that translates into tangible policy influence. His position on the Senate Finance Committee — where he has served as chairman or ranking member — makes him one of the most powerful legislators on tax policy, healthcare finance, and trade in the country.
He is a member of the Church of Jesus Christ of Latter-day Saints and has been a visible member of Idaho's LDS community throughout his career. Idaho's large LDS population, concentrated in the southeastern part of the state, has been a consistent base of support. He is married and has five children. Despite his long service and senior position, he is not a nationally prominent television presence — his power is exercised through committee work and negotiation rather than cable news performance.
Key Policy Positions
Tax Policy & Finance Committee
Crapo's most consequential work has been on the Senate Finance Committee, which has jurisdiction over the federal tax code, Social Security, Medicare, Medicaid, and trade agreements — the financial architecture of American government. He was a central figure in the 2017 Tax Cuts and Jobs Act, the largest overhaul of the federal tax code in three decades. He has been a consistent opponent of tax increases, particularly corporate tax hikes, and a supporter of extending the 2017 individual tax cuts that are set to expire. As of 2025-2026, the debate over extending the 2017 tax provisions has placed him back at the center of the most consequential fiscal negotiations in Washington.
Water & Public Lands
Idaho's economy is heavily dependent on agricultural water rights, federal land management, and natural resource extraction. Crapo has been a consistent advocate for state and local control over water policy, opposing federal regulations that he argues impinge on Idaho farmers' and municipalities' water rights. He has supported multiple iterations of the Clean Water Act rollback, arguing that the Obama-era "Waters of the United States" rule overextended federal jurisdiction. He has also advocated for timber harvesting on federal lands, grazing rights, and limitations on Endangered Species Act designations that restrict agricultural and development activity in Idaho.
Healthcare & Medicare
Through his Finance Committee role, Crapo has been involved in every major healthcare finance debate since the Affordable Care Act. He opposed the ACA, voted repeatedly to repeal it, and was part of the failed 2017 Senate effort to replace it. He has also worked on Medicare drug pricing legislation and opposed the prescription drug negotiation provisions in the Inflation Reduction Act, arguing that price controls reduce pharmaceutical innovation. More constructively, he has worked on bipartisan provisions like drug pricing transparency and some Medicare payment reforms that have attracted cross-party support. His Finance Committee position makes him unavoidable in any healthcare financing debate regardless of his public profile.
Senate Elections in Idaho
| Year | Opponent | Crapo % | Margin | Context |
|---|---|---|---|---|
| 1998 | Bill Mauk (D) | 70.0% | +40 | Open seat; Kempthorne ran for governor |
| 2004 | Scott McClure (D) | 99.2% | Uncontested | Write-in only opposition; safe as possible |
| 2010 | Tom Sullivan (D) | 71.3% | +43 | Tea Party wave; Crapo ran well ahead of national trend |
| 2016 | Jerry Sturgill (D) | 66.9% | +34 | Post-DUI, still won comfortably; Trump era |
| 2022 | David Roth (D) | 66.4% | +33 | Consistent large margins across all cycles |
