Japan's Prime Minister Naoto Kan attends a news conference at the Democratic Party of Japan election headquarters in Tokyo July 12, 2010. Voters dealt Japan's government a stinging blow in upper house elections on Sunday, a reverse that could thwart its ambitions to curb the country's massive public debt and threaten Prime Minister Naoto Kan's job. REUTERS/Toru Hanai (JAPAN - Tags: POLITICS ELECTIONS)