On Tuesday, the Keystone XL pipeline bill arrived at President Obama's desk and was promptly vetoed. So what does the future hold for the prospects of this major pipeline? This PBS NewsHour report showcases both sides of the debate — an environmentalist arguing we should be turning our sights to cleaner energy options, and a Keystone supporter who'd rather see crude flowing down the pipes than on oil trains. The Obama administration stated that they oppose the process of approving Keystone through Congress, rather than the pipeline itself. But it's clear that if Keystone is going to make it down the political pipes, it still has some obsticles to overcome.