U.S. President Barack Obama speaks about tightening gun regulations during a visit to the Denver Police Academy in DenverThrough Jeff Mason SAN FRANCISCO (Reuters) – President Barack Obama used fundraisers on Wednesday to assuage supporters' issues a few transnational oil pipeline and his dedication to tackling local weather change, while urging them to force Republicans out of power in Congress in 2014. The Obama administration is anticipated to come to a decision later this yr whether or not to approve construction of the Keystone XL pipeline, which would run from Canada's oil sands to Texas. Environmentalists oppose the project, pronouncing its carbon emissions would make a contribution unnecessarily to world warming. …