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Lech Kaczynski, mayor of Warsaw, top, and brother Jaroslaw Kaczynski. (AP photos)

People who think all politicians are alike can now point to Poland, where identical twin brothers are running to become the country's new president and prime minister.

Lech Kaczynski and Jaroslaw Kaczynski are topping the opinion polls as they campaign for Poland's parliamentary and presidential elections this year.

The brothers first found fame as child actors with angelic faces, performing in a film version of the popular children's book The Two That Stole the Moon.

Now sporting identical short silver hair, the 55-year-old brothers are better known for their tough talk in the fight against crime and corruption.

Lech Kaczynski, the younger sibling by 45 minutes and currently the mayor of Warsaw, kicked off his campaign with a TV ad that promised a moral revolution. He is the favourite to win Poland's presidential elections in October.

Jaroslaw Kaczynski leads the poll-topping centre-right Law and Justice Party, so he's in line to become the country's next prime minister.

With the unpopular former Communists who have been governing Poland mired in a string of bribery and corruption cases, the brothers' cleanup message has struck a chord with voters.

So far, the Kaczynskis have tried to avoid identical-twin confusion by not appearing together in public.

If elected, though, they will find it hard to pull any switches, as they used to do when they took tests for each other in high school. Lech Kaczynski has two distinctive moles on his face.