The DPJ, or the Democratic Party of Japan, has been the main rival for political power to the LDP, the dominant political party in the country since the mid-1950's.
How It's Used
"Now the tide has started to turn. In a historic defeat for the LDP, the DPJ won control of Japan's upper house in 2007. Since then, the approval ratings of first Prime Minister Fukuda and now Prime Minister Aso have only declined as support for the DPJ has surged. Tokyo municipal election results over the weekend, a bellwether for the national vote to follow, resulted in a decisive DPJ victory. This reinforced the party's strong lead in the polls and added a feeling of inevitability to what is to come in the August elections."