Key Facts
• August 22–24: Yomiuri poll shows Sanseitō leads opposition with 12% support.
• Sanseitō’s support rose from 1% in May to 12% in July post-election.
• July survey: Sanseitō surpassed Democratic Party for the People (11%) and Constitutional Democratic Party (8%).
• Current poll: Sanseitō maintains 12%, trailing ruling Liberal Democratic Party (23%).
• Other opposition support: Democratic Party for the People (9%), Constitutional Democratic Party (7%), Japan Innovation Party (4%).
• Sanseitō gained momentum after Senator Mizuho Umemura joined in June, increasing media exposure.
• Sanseitō expanded from 1 to 14 seats in the July Upper House election.
• Constitutional Democratic Party’s Hiroshi Ōgushi vows to rebuild after stagnant election results.
• Democratic Party for the People’s leader, Yuichiro Tamaki, attributes Sanseitō’s rise to active campaigning and media attention.
• Japan Innovation Party struggles with single-digit support despite leadership changes.
• Poll on coalition preferences: Democratic Party for the People (33%), Japan Innovation Party (23%), Constitutional Democratic Party (19%).
Summary
Sanseitō has emerged as the leading opposition party in Japan, maintaining a 12% support rate in the latest Yomiuri poll conducted from August 22 to 24. This marks a significant rise from 1% in May, driven by increased media exposure and a surge in seats during the July Upper House election. The party’s momentum has raised concerns among rivals, with the Democratic Party for the People and the Constitutional Democratic Party seeing slight declines in support to 9% and 7%, respectively. Sanseitō’s leader, Sohei Kamiya, highlighted the party’s growing popularity during a recent rally. Meanwhile, opposition leaders have expressed intentions to rebuild their parties, with the Democratic Party for the People’s Yuichiro Tamaki attributing Sanseitō’s success to active campaigning. The Japan Innovation Party remains stagnant with single-digit support despite leadership changes. The poll also revealed preferences for coalition partners, with the Democratic Party for the People leading at 33%.
