Republicans have a simple but wrong answer for everything. The Keystone Pipeline is not a magic panacea for jobs and cheap energy. The jobs are temporary and few in number while the effect on energy prices might be to raise them. For a fairly evenhanded assessment, see here.
This is a polemic against the pipeline. It may be a reasonable argument, but I wouldn’t call it evenhanded. It’s tough to find straight talk on this topic, really–the buzz has become deafening.