U.S. President Barack Obama arrived here today as part of a four-nation tour of Europe. Obama and his wife Michelle landed in Dublin, first stop on a week-long trip that will include visits to Britain, France and Poland and is aimed at bolstering ties with long-time allies.. Obama arrived on Air Force One on a windy, rainy day, and was due to hold talks with Irish President Mary McAleese, and later the Irish Prime Minister Enda Kenny, according to a report of Reuters. Later in the day he is expected to make a speech about U.S.-Irish ties in Dublin. Obama heads to Britain on Tuesday, where he will be feted by Queen Elizabeth at a formal state dinner. He then attends the Group of Eight summit in France before concluding his trip in Poland, where he will meet with leaders from eastern Europe.