Who is to fault for the oil spill; the failure of govt oversight in the Obama Adm or British Petroleum?

It started with the well. There were short cuts taken which may have led to the explosion, or not. We may never know. After the rig was destroyed and the oil was gushing into the Gulf Obama was offered help from other countries who had experience cleaning up these types of disasters, he declined allowing the oil to destroy much of the coastline and wildlife of the Gulf states. We won't get into the rest of the mess Obama and BP continue to create.