Poland's first years as an EU member saw a string of political crises as Lech and Jaroslaw Kaczynski, identical twins, shored up their conservative coalition government with radical nationalists and populists.

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Law and Justice's candidate in the contest is Lech Kaczynski, Jaroslaw's twin brother.

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If Lech wins, however, Jaroslaw would find it difficult to be prime minister, since most Poles are queasy about the idea of identical twins holding the country's two top jobs.

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In Poland Jaroslaw Kaczynski, prime minister for 16 months from mid-2006, and his late twin brother Lech, who was president from 2005 to 2010, picked spectacular fights at home and abroad.

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