"The Republican Speaker of the House of Representatives, John Boehner, criticised the Obama administration for failing to give the green light to a project that would have created "hundreds of thousands of jobs"."
"The oil industry has estimated the project would create 20,000 jobs, although the state department and some independent studies suggest a lower figure of 6,000 jobs."
Maybe it's an extension of supply side economics - by creating 6,000 jobs, this pipeline will allow several hundred thousand other people to also find employment.