Japan Democrats pick heavyweight Kan as next PM
Kan, 63, would become Japan's fifth prime minister in three years, taking the helm as the country struggles to rein in a huge public debt, engineer growth in an ageing society, and manage ties with security ally Washington and a rising China.
The party, which swept to power in a historic election last year but saw its ratings slide on doubts over outgoing premier Yukio Hatoyama's leadership during his brief eight months in office, needs to win the upper house election to ensure laws are passed smoothly.
(Reporting by Linda Sieg; Editing by Hugh Lawson)