For the first four elections, Tsutomu beat Kenji every time by tens of thousands of votes.

However, carried by the surge of the Democratic Party of Japan in the 2009 Japanese general election, Kenji was able to win the seat from Tsutomu and become a representative for the first time.

This victory was short-lived however, as in the 2012 Japanese general election, Tsutomu won back his seat with a large margin of over 80,000 votes, putting Kenji into 3rd place.

Tsutomu was able to secure major victories in the next 2 general elections, effectively denying the other candidates a seat on the Northern Kanto proportional representation block.

This started to change in 2021 when Takao Fujioka was able to secure a seat on the proportional district, closing the gap to just 4,820 votes.