Associated Press: Canada’s prime minister is reversing his position and will attend a United Nations climate change conference in Copenhagen next month, Stephen Harper’s spokesman said Thursday. Dimitri Soudas announced Harper decided to attend one day after U.S. President Barack Obama and Chinese Premier Wen Jiabao announced their attendance at the U.N. talks. Soudas said Harper’s decision was based on the fact that now “a critical mass of world leaders will be attending.” Soudas did not …