One excuse is that President Lech Kaczynski vetoes laws put forward by a government he detests.
Polish President Lech Kaczynski and Prime Minister Donald Tusk both issued statements mourning Edelman.
Law and Justice's candidate in the contest is Lech Kaczynski, Jaroslaw's twin brother.
The Polish government is keen on Lisbon, but the country's more sceptical president, Lech Kaczynski, is dithering about signing it.
President Lech Kaczynski said Jewish life flourished in Poland before millions of Jews were killed by Nazi Germany in the Holocaust.
The Lithuanian and Polish prime ministers - Gediminas Kirkilas and Lech Kaczynski, respectively - attended the signing ceremony in the Lithuanian capital Vilnius.
Official ceremonies being held a year after a plane crash that killed Poland's President Lech Kaczynski have been boycotted by his twin brother.
Until he ruled himself out on January 28th, Mr Tusk had been dithering about whether to run himself against the incumbent, Lech Kaczynski.
To be fair, the government faces one huge constraint: Law and Justice's Lech Kaczynski, twin brother of the former prime minister, who will be president until 2010.
The cancellations also threaten to affect the funeral on Sunday of Polish President Lech Kaczynski, who was killed in a plane crash last Saturday, with the attendance of many world leaders now uncertain.
The motorcade, carrying Georgian President Mikheil Saakashvili and Polish President Lech Kaczynski, was passing a checkpoint near Georgia's breakaway South Ossetia region -- site of intense conflict between Russian and Georgian troops in August -- when shots were fired Sunday, according to the Georgian Interior Ministry.
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.
Mr Kaczynski's twin brother, Lech, remains president, but his power will be much diminished.
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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