Obama keeps key ally in anti-ISIS fight as Cameron's party dominates UK elections

British Prime Minister David Cameron and his Tory party's decisive victory in parliamentary elections likely has President Obama breathing a sigh of relief, with analysts saying the win virtually ensures the continuation of vital U.K. support in fighting the Islamic State and other security matters.

"You need to have a very strong, robust Britain on the world stage," said Nile Gardiner, director of the Margaret Thatcher Center for Freedom with the Heritage Foundation. "I think it's very important that the United States has alon