Dozens of protesters opposed to the Keystone XL oil pipeline held a rally on Monday at the Washington, D.C., office of a firm lobbying on behalf of TransCanada, the company behind the pipeline. Four protesters were arrested after staging a sit-in and refusing to leave. The protest was held in solidarity with a more than six-week blockade in Texas where protesters are attempting to block progress on the pipeline’s construction. The Keystone XL would carry oil from Alberta’s tar sands to the Gulf Coast. President Obama has put off a decision on its approval until after the election.