Reuters: President Barack Obama is unlikely to be more specific about U.S. commitments to help provide financing for poor countries dealing with climate change when he arrives in Copenhagen, a U.S. official said. Obama arrives at the U.N. climate talks in Denmark on Friday morning. The U.S. official, speaking to reporters on a conference call on Thursday, said he could not predict whether world leaders would reach a deal at the conference but said Obama would stay committed to working …