CDP leadership election In the
2021 election, the seats held by the CDP slid from 108 to 96, and
Yukio Edano resigned to take responsibility. Izumi ran for party leader again following this, competing with three others;
Seiji Osaka,
Junya Ogawa, and
Chinami Nishimura. Recommendations for him came from the Izumi Group, the Naojo no Kai, a group of young party members, and
Ichiro Ozawa's own party faction. Izumi came first in the first round with 33.0% of member votes, but was forced into a runoff with
Seiji Osaka, who was closer to Edano during his time as party leader. In the second round, he won with 61.6% of votes, despite an attempt by Ogawa and Nishimura to unify behind Osaka.
Party leadership Izumi, who was appointed as the representative, appointed Osaka as the Deputy Leader, Nishimura as the secretary-general, and Ogawa as the Policy Research Chair to form a new executive committee. In addition,
Sumio Mabuchi was appointed as the Chairman of the National Relations Committee, and
Kensuke Onishi was appointed as the chairman of the Election Committee. In addition, he resigned as chairman of the Izumi Group when he became the leader. owever, there was dissatisfaction within the party that the party was abandoning its role as a pure opposition party, and in the 2022 representative question, the party attempted to change course to balance pursuit and proposal. In the
2022 House of Councilors election, where the CDP took a policy focused approach, the party lost six seats, and in terms of proportional representation, received less votes than
Nippon Ishin no Kai. There were calls within the party for Izumi to resign as leader, but he blunted these, deciding to stay on. Izumi also revamped his executive council, bringing on
Katsuya Okada as secretary-general,
Akira Nagatsuma as chairman of the Policy Research Council, and
Jun Azumi as chairman of the National Relations Committee, all experienced politicians who assisted the Democratic Party of Japan and served in the 2009-2012 governments. In September 2022, he also re-established the "NEXT Cabinet" system of naming government ministers for a possible CDP lead government. His named appointments were a mix of former ministers of the DPJ governments as well as younger members of the party, including Akira Nagatsuma becoming
Chief Cabinet Secretary, and
Kōichirō Genba being named as the
Minister for Foreign Affairs. Five of the thirteen named were women. More calls for resignation led to him promising that if the party didn't win over 150 seats in the next general election, he'd resign as leader. The
2024 by-elections saw the CDP sweep all four elections, resulting in a perfect victory. As his term expired in late 2024, he expressed interest in running again, but struggled to gather endorsements.
Ichiro Ozawa, who had backed Izumi in the previous election, had disputed with Izumi over party appointments while he was in office.
Yoshihiko Noda also ran using a similar platform appealing to centrist and conservative elements, which undermined Izumi's own support base. Four candidates including Izumi ran, but Izumi struggled to gather support. He ended up placing third, and did not make it to the second round of voting. Izumi commented that "I can't lie, I'm disappointed, but I will support Noda no matter what. i want to support and create a new form of politics." He was appointed as a permanent advisor to the party on 1 October. == Later career ==