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Britain's opposition Labour Party in crisis as left-wing outsider surges in leadership race

  • Contender for leader of Britain's Labour party Jeremy Corbyn outside his campaign headquarters in north London, Wednesday July 22, 2015.  Labour is seeking a new leader to rebuild the party after losing May's General Election to the Conservative party, and left-wing candidate Corbyn's message seems to have found strong support among party members, according to media reports Wednesday. (Stefan Rousseau / PA via AP) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

    Contender for leader of Britain's Labour party Jeremy Corbyn outside his campaign headquarters in north London, Wednesday July 22, 2015. Labour is seeking a new leader to rebuild the party after losing May's General Election to the Conservative party, and left-wing candidate Corbyn's message seems to have found strong support among party members, according to media reports Wednesday. (Stefan Rousseau / PA via AP) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES  (The Associated Press)

  • Contender for leader of Britain's Labour party Jeremy Corbyn outside his campaign headquarters in north London, Wednesday July 22, 2015.  Labour is seeking a new leader to rebuild the party after losing May's General Election to the Conservative party, and left-wing candidate Corbyn's message seems to have found strong support among party members, according to media reports Wednesday. (Stefan Rousseau / PA via AP) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES

    Contender for leader of Britain's Labour party Jeremy Corbyn outside his campaign headquarters in north London, Wednesday July 22, 2015. Labour is seeking a new leader to rebuild the party after losing May's General Election to the Conservative party, and left-wing candidate Corbyn's message seems to have found strong support among party members, according to media reports Wednesday. (Stefan Rousseau / PA via AP) UNITED KINGDOM OUT - NO SALES - NO ARCHIVES  (The Associated Press)

Former British Prime Minister Tony Blair is warning the Labour Party that adopting an "old-fashioned leftist platform" of tax-and-spend policies will lead to electoral oblivion.

Labour is seeking a new leader to rebuild after losing badly in May's election to the Conservatives. Left-wing lawmaker Jeremy Corbyn has gone from longshot to serious contender — to the horror of party chiefs.

Blair said Wednesday Labour should move on "but for heaven's sake, don't move back."

Corbyn accuses rival candidates of offering "austerity light" policies that provide no alternative to the Conservatives. His message has found strong support among party members, making him a front-runner.

Some Labour lawmakers have said they will try to oust Corbyn immediately if he wins the party ballot, whose result will be announced Sept. 12.