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The Scottish Socialist Party, rival left-wing party Solidarity, the Scottish Senior Citizens' Unity Party and UKIP are also contesting the by-election.
BBC: PM's wife joins by-election trail
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He has a populist competitor in the far-left Socialist Party, which promises to scrap the 3% deficit target and reverse market reforms to health care.
ECONOMIST: Dutch politics
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Among the disappointed were also the Christian Democrats, the centre-left D66 and the far-left Socialist Party, which until less than a month ago enjoyed unprecedented popularity.
ECONOMIST: Elections in the Netherlands