Oil refineries outside Channelview. Do we really need to add a tar-sands pipeline to the mix?Photo: KM&G-MorrisWill Hillary Clinton put the desires of a giant oil corporation ahead of the needs and health of low-income communities and communities of color? Will anyone else in the Obama administration stand up and stop her? With the State Department's comment period on a proposed tar-sands oil pipeline set to end Monday, these questions are about to be answered. The State Department is considering whether to grant approval to oil giant TransCanada to construct a pipeline -- the Keystone XL -- to carry the …