[1] Before the electoral reform, the area had formed part of the five-member Niigata 3rd district of former Liberal Democratic Party (LDP) president-prime minister, faction leader and "shadow shōgun" Kakuei Tanaka and his daughter Makiko Tanaka who became science and technology minister in the Murayama Cabinet in 1994.

The second ranking representative from the 3rd district in the last pre-reform election of 1993 had been former Takeshita faction Liberal Democrat Yukio Hoshino who joined the defecting Japan Renewal Party in the 1993 no-confidence vote against LDP president-prime minister Kiichi Miyazawa.

Only her husband Naoki (maiden name: Suzuki) continued the Tanaka tradition in the Diet as member of the House of Councillors from Niigata until 2016.

In 2021, Izumida was challenged by two independent candidates, Tamio Mori, former mayor of Nagaoka, and another former Niigata Governor Ryuichi Yoneyama.

[7] After the elections, Izumida, who managed to get a seat in the PR block, claimed he was asked to pay kickback money if he wanted to win.