Maybe the US oil industry is the price imposed by S.Arabia for its compliance in “taming” Russia. The latter agreed to play in the game in exchange for future super profits when the market will become less tense. I’m not sure that Obama’s political opponents are so heavily dependent on shale oil, since it’s relatively young market though.

Also the "campaign" may not last for too long

Saudi Arabia, OPEC’s biggest producer, is assuming an oil price of $80 a barrel for 2015, said John Sfakianakis, a former economic adviser to the country’s government.
Oil Caps Fifth Weekly Loss on Global Supply Glut Concern - Bloomberg