Susan Rice pushed back on critics of President Obama's foreign policy Friday as she unveiled the White House’s new national security strategy. Rice, the White House's national security adviser, said in a speech at the Brookings Institution that the nation is “stronger than we have been in a very long time” despite the bitter debates raging in Washington. “Too often, what's missing here in Washington is a sense of perspective. Yes, there is a lot going on. Still, while the dangers we face may be more numerous and varied, they are not of the existential nature we confronted during World...