Edano along with other DPJ candidates won all but one district in Saitama in the 2009 DPJ landslide, wiping out the Liberal Democratic Party (LDP) from the prefecture. Their fortunes were reversed in the 2012 general election. Edano was the only member of the Democratic Party of Japan (DPJ) in Saitama prefecture to retain his seat, as the party lost two-thirds of its seats nationwide amid a poor economy and relative geopolitical decline. While losing the race, Edano's resurgent LDP opponent Hideki Makihara managed to gain a proportional block seat. The margin closed down further in the 2014 election and Makihara was only within 3,300 votes from unseating Edano. Makihara was unable to overcome the margin in the 2017 election following the nationwide surge of the Edano-led CDP.[1] Edano was re-elected with a comfortable 20.28% majority.