Delay in government approval of TransCanada's (TRP) Keystone pipeline will keep US and global oil markets from reconnecting through 2013, Barclays says. Europe's Brent crude and US WTI traded within $1.00/barrel of each other until this year, when a US supply glut sent Brent to a $28 premium. 
Barclays says Keystone pipeline to the Gulf of Mexico was "paramount" in ending the dislocation, but firm now sees pipeline operational "in 2014 at the earliest." That means "a widening of the 2013 WTI-Brent spread could very well be in the offing."