Closed primaries exclude voters, encourage divisive behavior, and can subvert the will of Idahoans.

Janice McGeachin's four years as Idaho's lieutenant governor were fraught with controversy. In what Governor Brad Little called an "abuse of power," McGeachin on two occasions issued wide-ranging executive orders while the governor was temporarily out of state. She also spoke at a conference hosted by a white nationalist who called for "total Aryan victory." And when McGeachin violated the Idaho Public Records Act, a judge quipped that she "would stop at nothing, no matter how misguided, to shield public records from the public."

But though Republican McGeachin won the office in 2018 in a state that had not elected a Democrat to statewide office in 16 years, she was not even the first choice of most Republican voters. Of about 177,000 votes cast in the May 2018 Republican primary, just 51,000 voters - less than a third - picked McGeachin. Four other candidates split the remainder, putting McGeachin on top with only a plurality (more votes than anyone else but less than 50 percent). In other words, a majority of primary voters chose someone other than Janice McGeachin.

The very possibility of plurality winner elections conflicts with the concept of majority rule, a core tenet of democracy. Winners lacking majority support (like McGeachin) are not the norm in Idaho but they are not uncommon. A Sightline study of Idaho elections from 2012 to 2022 found that 11 percent of Republican primaries for statewide executive offices such as governor and attorney general produced a primary winner who earned only a plurality of votes, not a majority.

Idaho's primaries amplify the risk of a plurality winner in a race with three or more candidates. Closed partisan primaries attract low turnout, skewing toward the preferences of party diehards. Candidates can campaign on inflammatory ideas or personal attacks to stand out in a crowded field, emphasizing intraparty divisions and splitting the electorate. And even though independent and minority party voters pay for primary elections with their taxes, they are excluded from the process.

A recent gubernatorial race highlights the potential for the plurality winner problem to spill over into general election contests even in deep red Idaho. In 2022 independent candidate Ammon Bundy received the highest vote share of any candidate outside the two major parties in nearly a century. Under the current pick-one voting system, a strong independent candidate like Bundy could split the statewide vote, and someone who fails to represent most voters' values could be elected into office.

Other states, including Alaska, Georgia, Maine, and Mississippi, have implemented systems that guarantee majority-winner elections. A measure on November's ballot would do the same in Idaho.

Plurality winners by the numbers

A new Sightline study examined more than 1,700 Idaho primary and general elections from 2012 to 2022. The data included results for governor, lieutenant governor, attorney general, secretary of state, state controller, state treasurer, and superintendent of public instruction, along with senators and representatives at the state and federal levels. Altogether, the inquiry covered 1,748 races (667 general elections and 1,081 partisan primaries) over the decade. It revealed that:

In 91 percent of races, only one or two candidates ran for election, guaranteeing a majority winner.

Congressional and statewide executive elections were more likely than elections for legislative offices to attract a field of three or more candidates.

Overall, 11 percent of statewide executive races and 3 percent of state legislative races produced a plurality winner.

At the statewide and congressional levels, every instance of a plurality winner occurred in the Republican primaries.

Because the Republican Party dominates most general elections in Idaho, competitive elections play out mainly within Republican primaries. Plurality ...