However, the Democratic Party won the general election of 2009 handily, and Kobayashi defeated Machimura by 30,000 votes.

[3] Machimura resigned from his seat in the Hokkaidō proportional block to run in the resulting by-election in October 2010 and defeated former construction ministry bureaucrat Shigeyuki Nakamae by a clear margin to regain his district seat.

[4] In the 24 April 2016 by-election, Machimura's son-in-law, Liberal Democrat Yoshiaki Wada (Kōmeitō, Kokoro, Daichi) defeated united opposition independent Maki Ikeda (DP, JCP, SDP, PLP).

Wada was accused of receiving 'dark money' in the 2023–2024 Japanese slush fund scandal.

Subsequently, the LDP did not allow Wada to run in the Hokkaidō PR block and he lost his seat in the Diet.