Mr Olechowski will not compete in this year's election, and will let Mr Plazynski head Platform in parliament.
ECONOMIST: Poland
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At first Mr Olechowski hesitated to launch a new party.
ECONOMIST: Poland
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Platform is the brainchild of Andrzej Olechowski, a former foreign minister who ran a good second, without any party support, to the incumbent Social Democrat, Aleksander Kwasniewski, in last year's presidential election.