Here’s a news item from the Associated Press: BOISE, Idaho (AP) — Idaho's Republican presidential primary election cost taxpayers $1.9 million this year, coming in just slightly under what state officials originally estimated. Idaho lawmakers agreed to move the GOP presidential primary from May to March in 2015. The conservative-dominated Statehouse argued that doing so would allow the Gem State to play a bigger role in deciding the presidential nominee. However, Democratic lawmakers objected to the move. They argued that taxpayers should not pay for a separate partisan election that is closed to voters who aren't registered as a Republican. At the time, proponents said creating a separate election just for the GOP primary would cost $2 million. Ada County, the state's highest populated region, had the highest bill out of the state's 44 counties. Official requested more than $391,000 in reimbursements to hold a separate election.
The Idaho Democratic Party didn’t participate in the primary, but the Idaho Constitution Party did; it drew 485 voters for its Idaho presidential primary. All 226,711 of the rest of the ballots cast were from registered Republicans.
At last weekend's Democratic Party state convention, delegates approved a resolution calling for the party to move away from its caucus system to something more inclusive, like a primary.