Obama’s Rejection of Keystone Pipeline Sets Up Campaign Battle

President Barack Obama’s rejection of TransCanada Corp.’s Keystone XL pipeline permit exposed a split in a core Democratic constituency and handed Republicans a new line of election-year attack.

Unions representing construction workers condemned the move while labor groups including the United Steel Workers, the United Auto Workers and the Service Employees International Union joined with environmental advocates in saying they support Obama’s decision. It also triggered swift criticism from congressional Republicans and the party’s presidential candidates.