Guardian: Barack Obama has blocked a Republican bill that would allow a contentious extension of the Keystone oil pipeline, in a rare veto that arrived in low-key fashion but leaves open a long road to the end of his presidency.
Though long expected and downplayed by the White House, the symbolic clash over a pipeline from Canadian tar sands to US refineries on the Gulf coast is the first time the president has refused to sign legislation in his second term, and only the third veto of his presidency.
Obama...